Question

9. A boy is cycling such that the wheels of the cycle are making 140 revolutions per minute. If the diameter of the wheel is 60 cm, calculate the speed per hour with which the boy is cycling

Answer 1

circumference of cirle - 2*22/7*30 = 1320/7cm
for 140 revolutions = 140*1320/7 cm
for 1 hour = 20*1320×60=1584000

Answer 2

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