Question

A motor-cycle covers 100 km with a speed of 40 km/hr.

Average speed of whole journey 60 kmhr Using the formula, average speed 2xyx y x speed of first 100 km 40 kmhr 60 2 x 40 x y40 y 120 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 60 km/hr. MT

A 150 km/hr

B 126 km/hr

C 120 km/hr

D 140 km/hr

E 90 km/hr

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