The wheel of scooter has diameter 140 cm. How many revolutions per minute must the wheel make so that the speed of the scooter is kept at 132 km per hour?

Question: The wheel of scooter has diameter 140 cm. How many revolutions per minute must the wheel make so that the speed of the scooter is kept at 132 km per hour?Solution:Distance travelled by wheel in one revolution = circumference of wheel= 22/7 × 140 = 440 cm.Speed of scooter = 132 km/hr = (132 × 1000 × 100)/60 cm/min = 220,000 cm/min.The wheel has therefore got to travel 220,000 cm in 1 min i.e. it has to perform 220,000/440 revolution in 1 min = 500 revolutions.