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An aeroplane is to go along straight lin...

An aeroplane is to go along straight line from A to B, and back again. The relative speed with respect to wind is V. The wind blows perpendicular to line AB with speed v. The distance between A and B is l. The total time for the round trip is:

A

a, b, d are correct

B

a, b, c are correct

C

only a, d are correct

D

only b, d are correct Relative velocity

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