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 car moves from X to Y with a uniform speed V_(u) and returns to Y wi

1.	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
Answer» `SQRT(v_(u)v_(d))` `(v_(u)v_(d))/(v_(u)+v_(d))` `(v_(u)+v_(d))/(2)` `(2v_(u)v_(d))/(v_(d)+v_(u))` Answer :B::D