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Q.

The diameter of each wheel of a car is 70 cm. If each wheel rotates 400 times per minute, then the speed of the car (in km/hr) is $Take π = \frac{22}{7})$

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a

5.28

b

52.8

c

0.528

d

528

answer is A.

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Detailed Solution

Required speed

$= 400 \times 60 \times 2 \times \frac{22}{7} \times \frac{70}{2} \times \frac{1}{100} \times \frac{1}{1000} = 52.8 kmph .$

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