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

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vuvd

vdvuvd+vu

vu+vd2

2vdvuvd+vu

answer is D.

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Detailed Solution

Average speed=total distance travelledtotal time taken=s+st1+t2=2ssvu+svd=2vuvdvd+vu

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