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Question

What is the radius (in cm) of the tyre in a car, if it covers 0.396 km in 300 rotations? (Use π = 227)


A

14 cm

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B

21 cm

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C

7 cm

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D

28 cm

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Solution

The correct option is B

21 cm


The circumference of the tyre = 2πr (Distance travelled in each rotation)

Total Distance = Distance covered in 1 rotation x Number of rotations

0.396=2×227×r×300

r=0.396×72×22×300

Hence r = 0.00021 km or 21 cm.


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