Question

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