A wheel of radius 2 1 m of vehicle makes 75 revolutions in 1 min what is the speed of the vehicle ........

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A wheel of radius 2.1 m of vehicle makes 75 revolutions in 1 min. what is the speed of the vehicle?

78 km/hr

59.4 km/hr

37.4 km/hr

35.4 km/hr

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Explanation:

Radius of the wheel = 2.1 m and time taken to do given number of revolutions = 1 min = 1/60 hr
Distance covered in 1 revolution = 2πr
= 2 x 22/7 x 2.1
Distance covered in 75 revolutions;
= 75 × 2 × 22/7 x 2.1
= 990 m = 0.99 km
Reqd speed = 0.99 / 1/60 = 59.4 km/h