A car moves from X to Y with a uniform speed vu and returns to Y with a uniform speed vd. The average speed for this round trip is

Question

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

$\sqrt {{v_u}{v_d}} $

${{{v_d}{v_u}} \over {{v_d} + {v_u}}}$

${{{v_u} + {v_d}} \over 2}$

${{2{v_d}{v_u}} \over {{v_d} + {v_u}}}$

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