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A boy is cycling such that the wheels of...

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.

Text Solution

Verified by Experts

The correct Answer is:
`15.84km//hr`
Number of revolutions per hour `=(140xx60)=8400`
Distance covered in 1 revolution `=2piR=(22/7xx60)cm`
Distance covered in 1 hour `=` distance covered in 8400 revolutions
`=(22/7xx60xx8400)cm=(22xx72000xx1/100xx1/1000)km`
`=1584/100km=15.84km=` speed per hr.
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