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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

Distance= 2dTotal time= duu+dudAverage speed= 2uuuduu+ud
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