The diameter of the dr

Question

The diameter of the driving wheel of a bus is 140 cm. how many revolutions per minute must the wheel make in order o keep a speed of 66 kmph ?

Options:

A . 235

B . 240

C . 245

D . 250

Answer: Option D

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 m.

`:.` Number of revolutions per min = `(1100/44)` = 250 .

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