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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 `nu_u` and returns to Y with a uniform speed `nu_d` .The average speed for this round trip is:

A

`(nu_u+nu_d)/2`

B

`(2nu_dnu_u)/(nu_d+nu_u)`

C

`sqrt(nu_unu_d)`

D

`(nu_dnu_u)/(nu_d+nu_u)`

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