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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

`(2)/(v _(d) + v _(u))`

B

`(2)/( v _(u) +v _(d))`

C

`(2 v _(d) v _(u))/(v _(d)+ v _(u))`

D

`(v _(u) + v _(d))/(2)`

Text Solution

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The correct Answer is:
C
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