Water velocity 2 km per hour, it is 8 kilometers per hour in still water sailing, sailing downstream hour line kilometers per hour sailing against the current line km, 50 km downstream navigation needed hours.
2) a ship in still water in the speed of 7 kilometers per hour, flow rate of 2 km per hour, it's speed against the current , if the sail against the current 3 hours, you can sail ( ) km.
3) of a ship sailing speed of 17 kilometers per hour, sailing against the current speed of 10 km per hour, then the ship's hydrostatic speed per hour kilometers per hour flow rate of the line ( ) km.
4) a ship in still water in the line of 8 km per hour, 4 hours sailing against the current line of 24 km, then the flow rate per hour kilometers per hour against the current rate of km .
Second, the application questions
1) a ferry line in the 9 km per hour in still water, sailing against the current in a river in line 3 hours, 21 km. This fast is the river flow?
2) a boat speed in still water in the line of 18 kilometers per hour,cheap UGG boots, flow rate of 2 km per hour. The ship sailed from A to B in Hong Kong in Hong Kong against the current need for 15 hours, A and B is the number two kilometers away from Hong Kong?
3) a ship sailing in still water, the line of 13 kilometers per hour. The ship sailed in a river 80 km downstream, known speed of the water 3 kilometers per hour, you need a few hours? If the original way back, you need a few hours?
4) line of 15 kilometers per hour, a ship, which sailed against the current line of 6 hours, 72 km downstream traffic as if it is how many hours long flight?
5) A, B and 240 km away from the two ports. A ship against the current 15 hours to line the entire distance, this range of known flow rate of 4 km per hour. The ship sails the number of hours to use the line the entire distance?
6) B is the distance between the two ports .140 km. A ship bound from a port B port, 7 hours to reach downstream from the B to return a Hong Kong against the current 10 hours. The ship's speed in still water and flow rate is the number?
7) 180 km away from the two terminals. A passenger ship sails full range line for 10 hours, the known speed of the river of the water 3 kilometers per hour. Only against the current line of fully-way passenger how many hours?
8) a boat to and from the fairway for some 120 kilometers long between the lines on the line for 10 hours, 6 hours down the line when the ship sailing in still water in the water velocity is the speed and how much?
9) a ship bound from a port B port, downstream and the line for 28 kilometers per hour, when Hong Kong returned a row against the current use of 6 hours. Known water velocity 4 km per hour, A, B the number of kilometers away from the two ports?
10) a ship in Hong Kong from a downstream port to the line B to 8 hours, return to the line per hour less than 9 km downstream. Known A, B and 216 km away from the two ports, returns multiple rows when compared to a few hours? How much per hour speed of the water meters?
11) B 180 km away from the two ports. A ship from a port down the river 10 hours and B port, known ship speed is 8 times the speed of water. The ship returned from a Hong Kong B with the number of hours?
12) B 360 km away from the two stations. passenger cars and trucks heading for the same time from a station B stations, bus lines 60 kilometers per hour, the line 40 kilometers per hour, trucks, buses arrive B station 0.5 hours to stay on, he returned the original speed a station, the location of the two vehicles met across many kilometers away from the B station?
13) A walk 50 meters per minute, walk 60 meters per minute, B, C each minutes to 70 meters, two from A to B, C one starting from the opposite direction simultaneously B and C met B 2 minutes after they met A, A, B the number of meters away from the two?
14) A , B 21 km away from the two places, from A to a starting line of 4 km per hour, while B starting from the opposite direction to the line B, line 3 kilometers per hour. On the way met after both of them contrary to the the line. their destination after the immediate return of the land, the way the second meeting. meeting point between the two the number of kilometers apart?
15) a passenger and a freight train and rode the same time from opposite two out After 18 hours the two vehicles met in a place known to the two 1488 km apart, trucks per hour less than the bus line 8 km, 3 hours driving trucks to be suspended every 1 hour, the bus line number of kilometers per hour ?
16) A, B and the distance between the two places is 600 kilometers, 8 am bus to the average speed of 60 kilometers per hour from A to B bound. trucks to 50 thousand per hour meters per hectare of land from B to bound. For the midpoint of the two vehicles met in full, trucks must be the starting points in the morning?
17) two met on his way off the train, passengers in a car to miss that car B car B share 6 seconds. known line of 45 kilometers per hour, a car, car B line 36 kilometers per hour, how many meters in length and B cars?
18) Zhang and Wang, respectively, from A, B and two villages on the same flight, walking back and forth between the two villages (right after arrival at another village, to return),Discount UGG boots, they are the first from a village 3.5 kilometers encounter, in the village, 2 kilometers away from the B. The second meeting, ask them where they met the fourth time the number of kilometers from the village B?
19) A village 6 km away from the village B, Zhang and Wang, respectively, from A, B and two villages on the same flight, walking back and forth between the two villages (the village immediately after the arrival of another return). In starting 40 minutes after the two first met. Wang arrived back after a village,UGG shoes, a village 2 km away from the place where they met the second time. Zhang and Wang rate of the number of kilometers?
20) Zhang from A to B, walk 5 km per hour, Wang from point B to point A, walk 4 km per hour. both on the same flight, and then from the A and B two places where the midpoint of a 1 km met, find A and B is the distance between the two places many kilometers?
21) A,UGG boots cheap, B and two were from the A, B both on the same flight, in the A, B running back and forth between. A running 3 meters per second, B 7 meters per second run, if they are the fourth second meeting point and meeting point between the fifth 150 meters apart, find the A, B between the number of meters apart?
23) a small boat from A to B and from one place to share 2 hours. back downstream when compared to the travel time of more than 8 kilometers per hour speed, so the first hour of the second hour more than driving 6 km. find the distance between A to B.
24) an enemy violations of airspace, I engaged the machine off immediately, 50 km apart in two planes, the enemy in order to reverse the head speed of 15 km per minute to escape, I drive to the speed of 22 km per minute chase, and when I drive recovery 1 km to the enemy fighting with the enemy, only half a point to be enemy aircraft shot down. enemy turned away to be shot down from the number of common points?
25) A, B two weeks around the runway is 400 meters long run, starting from the same location if they back the line, then after 2 minutes met; if they proceed in the same direction from the same place the line, then after 20 minutes, the two met, known A faster rate than B, find A and B both running speed is the number?
26) Some people ask the question, A and B relative to the same two lines, distance of 100 km, A walk 6 km per hour, B walked 4 km per hour. There is always a time to meet. A with a dog, go 10 km per hour, the dog who went fairly fast, along with a starting collision to B, it is to go to the party, met a party to go further into it. Q: How many kilometers of walking a total dog?
27) Express 182 meters long, 20 meters per second row , climbing 1,034 meters long, 18 meters per second line. the two vehicles in the same direction parallel to the front when the two vehicles together, the Express can be over a few seconds slow?
28) a person to the speed of 120 meters per minute along the railway side of running. a long 288 meters off the train from the opposite side from him by using the 8 seconds, find the speed of the train.
29) a train length of 600 meters, it is 10 meters per second speed through the tunnel 200 meters long, into the tunnel from the front to the rear of the vehicle to leave the tunnel require a total of how much time?
30) has two trains, a 102 meters long, 20 meters per second row; a length of 120 meters, 17 meters per second line. the two vehicles in the same direction and the line, the second from the first train to catch the train to leave the two vehicles takes a few seconds?
31) a person walking speed of 2 meters per second. a train came from behind to open more than he took 10 seconds. are known to train 90 meters long. Find the speed of the train.
32) while the existing two trains together with the direction of the first road, the line after 12 seconds express more than slow. Express line of 18 meters per second, slow line of 10 meters per second. If the rear of the two trains simultaneously in the same direction of Qi, then climbing more than 9 seconds after the express train, find the two trains in length.
33) a train through 440 meters of the bridge will take 40 seconds, with the same speed through the tunnel 310 meters to 30 seconds. The train's speed and body length is the number?
34 ) Little Britain, and Xiao-Fei Shi and had to measure the train speed and body length, they took two stopwatch. Xiaoying down with a table in front of the train from her time spent by 15 seconds; Xiao-use Another note of a table over from the front to the rear of the first wire rod wire rod through the second time it takes is 20 seconds. the known distance between the two poles is 100 meters. you can help small British and small Min calculate the length and speed of the train you?
35) a train through the bridge 530 meters requires 40 seconds, with the same speed through 380 meters of the cave need
30 seconds. seeking The train's speed and body length is the number of meters.
36) both sides of the trail along the railway line, starting from the two places, at the same speed relative to the line. a train, the whole A side from the opened train took 10 seconds .3 points, B met the train, all trains from the B side opened only 9 seconds. how much time the train left the B after the two met?
37) Two trains, a length of 120 meters, 20 meters per second line; another column 160 meters long, 15 meters per second line, the two vehicles towards the same direction, from the front to the rear of the vehicle to leave the encounter takes a few seconds? < br>
38) a person walking speed of 2 meters per second. a train from the back off, he spent over 10 seconds. known as the 90 meters long train, find the speed of the train.
39) A, B and two opposite and along the railway line, at the same rate, a train opened from a side with 8 seconds left after 5 minutes and a case of B, from B side had one, and only 7 seconds, and asked from the B and B a few minutes the train began to meet two met?
40) when a 60-meter race crossed the finish line, more than 10 m B lead, C 20 than the leading, if B and C according to the original speed to cross the finish line, then when B B lead at the finish than how many meters?
No comments:
Post a Comment