A wheel has a radius of 14 cm. How many revolutions must it make to cover a distance of 88 meters? MCQ with Answer and Explanation

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A wheel has a radius of 14 cm. How many revolutions must it make to cover a distance of 88 meters?

A. 120

B. 150

C. 100

D. 80

Answer: Option C

Solution (By JKSSB Mock Tests)

Circumference of the wheel = 2 * (22/7) * 14 = 88 cm = 0.88 meters. Total distance = 88 meters. Number of revolutions = 88 / 0.88 = 100.

This question belongs to: Maths Time Speed and Distance

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Question #1

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If a person covers a distance of 180 km in 4 hours, find his speed in meters per second.

A. 13.5 m/s

B. 11.5 m/s

C. 12.5 m/s

D. 14.5 m/s

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Correct Answer: Option C

Explanation:
Speed = 180 / 4 = 45 km/h. Converting to m/s = 45 * (5/18) = 12.5 m/s.

This question belongs to: Maths Time Speed and Distance

Question #2

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A train running at 54 km/h takes 20 seconds to pass a bridge. Next, it passes a man walking at 6 km/h in the same direction in 12 seconds. Find the length of the bridge.

A. 150 meters

B. 160 meters

C. 140 meters

D. 120 meters

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Correct Answer: Option C

Explanation:
Speed of train = 54 km/h = 15 m/s. Speed of man = 6 km/h = 5/3 m/s. Relative speed = 15 - 5/3 = 40/3 m/s. Length of train = Relative speed * time = (40/3) * 12 = 160 meters. To pass bridge: Total distance = Length of train + Length of bridge = 15 m/s * 20 seconds = 300 meters. Length of bridge = 300 - 160 = 140 meters.

This question belongs to: Maths Time Speed and Distance