A wheel has a radius of 42 cm. How many revolutions must it make to cover a distance of 132 meters? MCQ with Answer and Explanation

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A wheel has a radius of 42 cm. How many revolutions must it make to cover a distance of 132 meters?

A. 70 revolutions

B. 60 revolutions

C. 40 revolutions

D. 50 revolutions

Answer: Option D

Solution (By JKSSB Mock Tests)

Circumference of the wheel = 2 * (22/7) * 42 = 264 cm = 2.64 meters. Total distance = 132 meters. Number of revolutions = 132 / 2.64 = 50 revolutions.

This question belongs to: Maths Time Speed and Distance

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A person row a boat 16 km upstream in 4 hours. If the speed of the current is 1 km/h, find the speed of the boat in still water.

A. 4 km/h

B. 6 km/h

C. 7 km/h

D. 5 km/h

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Correct Answer: Option D

Explanation:
Upstream speed = 16 / 4 = 4 km/h. Upstream Speed = Speed in still water - Current speed => 4 = Speed in still water - 1 => Speed in still water = 5 km/h.

This question belongs to: Maths Time Speed and Distance