Question

the radius of the wheel of a car is 70 cm .Find the speed of the car in km per hour when the wheel makes 75 revolutions in a minute

Answer 1

radius of the wheel = 70cm

distance traveled by the wheel in one revolution = circumference of the wheel

= 2 * 22/7 * 70

= 440 cm

distance traveled in 75 revolutions = 440*75

= 33000cm

= 330m

speed of the car = distance/ time

= 330/1min

= 330/60secs

= 5.5m/sec

and in km/hr

it is-

5.5 * 18/5

= 19.8km/hr

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