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A, B two cars at the same time from a, B two places, relative to each other, 3 hours meet, known a car to complete the whole journey in 8 hours, B car to complete the whole journey in a few hours
I didn't know if it was right
Let a speed x, then the total distance is 8x
A speed + B speed + 8x / 3
Another speed is X
So B is 5 / 3x
When y is set, B completes the whole journey
8x=5/3xy
8=5/3y
y=24/5
A car drove from a to B at a speed of 40 kilometers per hour. After 3 hours, due to rain, the average speed was forced to decrease by 10 kilometers per hour. As a result, the time to B was 45 minutes later than expected. The distance between a and B was calculated
45 minutes, 3 / 4 hours
Design: plan to drive from place a to place B in X hours
It is planned to drive from place a to place B in X hours at a speed of 40 km / h. The actual driving speed is 40 km / h in 3 hours, and the driving speed is (40-10) km / h in X + 3 / 4-3 hours
40X＝ 40×3＋﹙X ＋ 3/4－3 ﹚×﹙40－10﹚
X＝21/4
40 × 21 / 4 = 210 km
A: the distance between a and B is 210 kilometers
------------Hope to adopt,
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