Question

The wheels of a car are of diameter 80cm each. How many completed revolution does each wheel make in 10minutes when the car is travelling at a speed of 66kmper hour?
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Answer 1

$number \: of \: revolution \: = \frac{total \: distance}{distance \: covered \: in \: 1min \: }$

diameter of circle is = 80cm

radius

$radius = \frac{80}{2}$

$= 40cm$

distance covered in 1 revolution = circumference of wheel .

=2πr

= 2×π×40

= 80π cm

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