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A and B set out from a to B at the speed of 4 kilometers per hour at the same time. After walking 2.5 kilometers, a returned to a to pick up the documents. He rushed to a at the speed of 6 kilometers per hour. After getting the documents, he still chased b back at the speed of 6 kilometers per hour. As a result, they arrived at B at the same time. It is known that a delayed 15 minutes in the office to pick up the documents, so we can find the distance between a and B
Suppose that the distance between a and B is x kilometers. According to the meaning of the question, we can draw the following conclusion: & nbsp; X − 2.54 = x + 2.56 + 1560 & nbsp; 3 (x-2.5) = 2 (x + 2.5) + 3 & nbsp; & nbsp; 3x-7.5 = 2x + 5 + 3 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 15.5 A: the distance between a and B is 15.5km
It took 10 hours for a and B to go from a to B at the same time, 4 hours more than B. It is known that the speed difference between a and B is 5km per hour, and the distance between a and B is 5 km
How many kilometers is it?
Crystal love 6930,
A. every hour
1÷10＝1/10
B. every hour
1÷（10－4）＝1/6
The distance between the two places is:
5 (1 / 6-1 / 10) = 75 (km)
A and B walk from a to B at the same time. A walks 5km an hour, B walks 3km an hour. When a arrives at B, B is 6km away from B, and a walks for several hours
V A / v b = 5 / 3
V A * t = v b * t + 6
V a = 5 / 3V B
5 / 3V b * t = v b * t + 6
2 / 3V b * t = 6
2/3*3*t=6
T = 3 hours
Party A and Party B set out from a to B at the same time. Party A walked 3km per hour, and Party B walked 5km per hour. After 10 hours, Party B arrived at B and returned immediately
On the way to meet a asked two people from the start to meet how long
Whole course: 5 × 10 = 50 km
From departure to meeting, Party A and Party B make a total of 2 whole journey, which is 50 × 2 = 100 km
Every hour, Party A and Party B travel 3 + 5 = 8km
Sharing time: 100 △ 8 = 12.5 hours
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