A person covers a distance of 12 km in 1 hour 30 minutes. What is his speed in meters per second? MCQ with Answer and Explanation

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A person covers a distance of 12 km in 1 hour 30 minutes. What is his speed in meters per second?

A. 2.77 m/s

B. 2.50 m/s

C. 2.00 m/s

D. 2.22 m/s

Answer: Option D

Solution (By JKSSB Mock Tests)

Time = 1.5 hours. Speed = 12 / 1.5 = 8 km/h. To convert into m/s, multiply by 5/18. Speed = 8 * (5/18) = 40 / 18 = 2.22 m/s.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A person can row 8 km/h in still water. He finds that it takes him thrice as long to row upstream as to row downstream. Find the speed of the current.

A. 4 km/h

B. 6 km/h

C. 5 km/h

D. 3 km/h

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Correct Answer: Option A

Explanation:
Let current speed be c. Upstream speed = 8 - c, Downstream speed = 8 + c. Given: 3 * (8 - c) = 8 + c => 24 - 3c = 8 + c => 4c = 16 => c = 4 km/h.

This question belongs to: Maths Time Speed and Distance

Question #2

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A sound wave travels at 340 m/s. How much distance in kilometers does it cover in 20 seconds?

A. 7.5 km

B. 7.2 km

C. 6.5 km

D. 6.8 km

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Correct Answer: Option D

Explanation:
Distance = Speed * Time = 340 * 20 = 6800 meters. Converting to kilometers = 6800 / 1000 = 6.8 km.

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Question #3

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In a 100-meter race, A can beat B by 10 meters and C by 19 meters. In a race of 90 meters, by how many meters can B beat C?

A. 10 meters

B. 9 meters

C. 11 meters

D. 8 meters

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Correct Answer: Option B

Explanation:
When A covers 100m, B covers 90m and C covers 81m. This means in a distance where B covers 90 meters, C covers 81 meters. Therefore, B beats C by 90 - 81 = 9 meters.

This question belongs to: Maths Time Speed and Distance

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