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?
(A) 200 (B) 300 (C) 250 (D) 350
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Circumference of the wheel = 2πr = π x diameter = π x 140 cm
= π x 140 = 440 cm
Distance covered by the wheel in one minute = (66 x 1000 x100) / 60 = 110000 cm
Number of revolutions in one minute = 110000 / 440 = 250.
= π x 140 = 440 cm
Distance covered by the wheel in one minute = (66 x 1000 x100) / 60 = 110000 cm
Number of revolutions in one minute = 110000 / 440 = 250.
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