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A car moves from X to Y with a uniform s...

A car moves from `X` to `Y` with a uniform speed `v_u` and returns to `X` with a uniform speed `v_d`. The average speed for this round trip is :
(a) `(2v_(d)v_(u))/(v_(d)+v_(u))` (b) `sqrt(v_(u)u_(d))` (c) `(v_(d)v_(u))/(v_(d)+v_(u))` (d) `(v_(u)+v_(d))/(2)`

A

`(V_(u)+V_(d))/(2)`

B

`(2V_(a)V_(d))/(V_(d)+V_(a))`

C

`sqrt(V_(a)V_(d))`

D

`(V_(d)+V_(a))/(V_(d)+V_(a))`

Text Solution

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The correct Answer is:
B
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