Q.

A car moves from X to Y with a uniform speed  υu and returns to Y with a uniform speed υd.  the average speed for this round trip is:

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a

2υdυuυd+υu

b

υuυd

c

υuυdυd+υu

d

υu+υd2

answer is A.

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Detailed Solution

Time taken= duu+dud distance= 2d average speed= 2duuudd(uu+ud)
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A car moves from X to Y with a uniform speed  υu and returns to Y with a uniform speed υd.  the average speed for this round trip is: