Question

car travels from A to B covering half the distance at v, and the remaining half af the distance at . This car then returns from B to A a y. If the time taken for the return journey from B to A is half of the time taken to go from A to B, find the relation between v1 v2. v3​

Answer 1

Explanation:

ist you need to know avg speed is Total distance/total time

In given questions it is mentioned that 2 by 5 of distance is travelled with V1 speed and 3by 5 of distance is travelled with V2 speed

You can think it as follow total distance is 5 unit and one travel 2 unit with v1 speed and 3 unit with V2 speed

toatal distance 5 unit

total time= 2/v1 + 3/v1

avg speed = 5/(2/v1 +3/v2)

= 5v1 v2/(2v2+3v1)

Answer 2

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Avg speed is: Total distance/total time

Toatal Distance = 5 unit

total timex= 2/v1 + 3/v1

Avg speed = 5/(2/v1 +3/v2)

= 5v1 v2/(2v2+3v1)