A car moves from `X` to `Y` with a uniform speed `v_u` and returns to `Y` with a uniform speed `v_d`. The average speed for this

A car moves from `X` to `Y` with a uniform speed `v_u` and returns to `Y` 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 car moves from `X` to `Y` with a uniform speed `v_u` and returns to `Y` with a uniform speed `v_d`. The average speed for this round trip is :

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