Q. 333.7( 8 Votes )

A boy is cycling in such a way that the wheels of his bicycle are making 140 revolutions per minute. If the diameter of a wheel is 60 cm, calculate the speed (in km/h) at which the boy is cycling.

Answer :

Given diameter of wheel = d = 60 cm


Number of revolutions in one minute = 140


Number of revolutions in one hour = 140×60


Number of revolutions in one hour = 8400


Distance covered in one revolution = circumference of wheel


Distance covered in one revolution = πd



= 188.57 cm


Distance covered in one hour = Distance in 1 revolution × no. of revolutions


Total distance covered in one hour = 188.57× 8400


Total distance covered in one hour = 1583988 cm = 15.839 km


speed with which boy is cycling = 15.839 km/hr


The speed with which boy is cycling is 15.839 km/hr


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