The diameter of the driving wheel of a bus is 140 cm. How many revolutions per minute must the wheel make in order to keep a speed of 66 km per hour?

The diameter of the driving wheel of a bus is 140 cm. How many revolutions per minute must the wheel make in order to keep a speed of 66 km per hour? Correct Answer 250

peed of the bus = 66 km/hrDistance covered by the wheel in one minute = 6066 × 1000 × 100​ = 110000 cmCircumference of the wheel = 2 × 22/7​ × 70 = 440 cmTherefore, distance covered by the wheel in one revolution = 440 cmHence, number of revolutions in one minute = 110000/440​ = 250 times  
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