2. The diameter of the wheels of a bus is 140 cm. How many complete revolutions each wheel make in 20 min if the speed of the bus is 72.6 km/hr?
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Correct option is
A
250
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
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