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The circumferences of the front and r...

The circumferences of the front and rear wheels of a bicycle are 3.5 m and 3 m respectively. If the vehicle is moving at a speed of 15 m/sec, the shortest time in which both the wheels will make a whole number of turns is (a) 1.4 seconds    (b) 2.1 seconds    (c) 4 seconds    (d) 6.4 seconds

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