The radius of the wheel of a vehicle is 70 cm. The wheel makes 10 revolutions in 5 seconds. The speed of the vehicle is?

29.46 km/hr.
31.68 km/hr.
36.25 km/hr.
32.72 km/hr.

Correct Answer: 31.68 km/hr.

Explanation:

Circumference = 2πr
= 2 x (22 / 7) x 70 cm
= 440 cm
Distance travelled in 10 revolutions = 440 x 10 cm
= 4400 cm
= 44 m
∴ Speed = distance / time
= 44 / 5 m/sec
= (44 / 5) x (18 / 5) km/hr
= 31.68 km/hr

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