The wheel of a car is of diameter 70 cm. The number of revolutions per minute must the wheel make so as to keep a speed of 66 km/hour will be?
- 300
- 400
- 500
- None of these
Explanation
Diameter = 70 cm
Circumference = pi _ D = 22/7 _ 70 = 220 cm = 2.2 meter
Speed = 66 km/hour = 66000 meter / 60 minute = 1100 meter/minute
Revolutions per minute = Distance covered in 1 minute / Circumference
= 1100 / 2.2
= 500
Last verified on 20-10-2026
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