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A helicopter flies from a city A to B .T...

A helicopter flies from a city A to B .The line joining A and B is along north-south and its length is 100km .The speed of the helicopter is kept 100kmph and wind blows from west to east with a speed of 60kmph .The time taken by the helicopter is (A) 0.75h (B) 2.0h (C) 1.25h (D) 1.33h

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