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The distance between the two vehicles is 87km after driving for 1.5 hours. After driving for another 2.5 hours, the distance between the two vehicles is 38km. If the speed of car a is 30, the speed of car B is 30
(87+38)/2.5=50
50-30=20
The speed of car B is 20
Car a and car B depart from 183 km away from each other. The speed of car a is 42 km / h, and that of car B is 38 km / h. on the way, car B is due to repair
The car was delayed for 1.5 hours. After the repair, it continued to move forward at the original speed. The distance between the two cars was 40 kilometers. How long did car a go?
Let a be in the form of a for X hours
42x+38×（x-1.5）=183+40;
80x-57=223;
80x=280;
x=7/2;
So a drives for 3.5 hours
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