Question: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 kmph ?
Answer Distance to be covered in 1 min. `= (66 xx 1000/60) m` `= 1100 m.` Circumference of the wheel `= (2 xx 22/7 xx 0.70) m` `= 4.4` :. Number of revolutions per min `= (1100/4.4)` `= 250`
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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 kmph ?