10. The diameter of a wheel of a bus is 140cm. How many revolutions per minute must the wheel make in
order to keep a speed of 66 Km per hour.
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Answer:
Speed of the bus = 66 km/hr
Distance covered by the wheel in one minute =
60
66×1000×100
=110000 cm
Circumference of the wheel = 2×
7
22
×70=440 cm
Therefore, distance covered by the wheel in one revolution = 440 cm
Hence, number of revolutions in one minute =
440
110000
=250
Have a nice day.......
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