Question

A motor-cycle covers 100 km with a speed of 50 km/hr.

Average speed of whole journey 75 kmhr Using the formula, average speed 2xyx y x speed of first 100 km 50 kmhr 75 2 50 y50 y 150 kmhr

find the speed of the motor-cycle for the next 100 km journey so that the average speed of the whole journey will be 75 km/hr.

A 117 km/hr

B 150 km/hr

C 120 km/hr

D 88 km/hr

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