A person can row 10 km/h in still water. If the speed of the river current is 3 km/h, find the time taken to row 28 km upstream. MCQ with Answer and Explanation

Question

A person can row 10 km/h in still water. If the speed of the river current is 3 km/h, find the time taken to row 28 km upstream.

A. 6 hours

B. 4 hours

C. 3 hours

D. 5 hours

Answer: Option B

Solution (By JKSSB Mock Tests)

Upstream speed = 10 - 3 = 7 km/h. Time taken = 28 / 7 = 4 hours.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A sound wave covers a distance of 1.36 km in 4 seconds. Find the speed of sound in m/s.

A. 320 m/s

B. 350 m/s

C. 340 m/s

D. 360 m/s

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Correct Answer: Option C

Explanation:
Distance = 1.36 km = 1360 meters. Speed = Distance / Time = 1360 / 4 = 340 m/s.

This question belongs to: Maths Time Speed and Distance

Question #2

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A car travels a distance of 300 km at a certain speed. If the speed is increased by 15 km/h, it takes 4 hours for the journey. Find the original speed.

A. 70 km/h

B. 55 km/h

C. 60 km/h

D. 65 km/h

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Correct Answer: Option C

Explanation:
New speed = 300 / 4 = 75 km/h. Since new speed is original speed + 15 km/h, the original speed = 75 - 15 = 60 km/h.

This question belongs to: Maths Time Speed and Distance

Question #3

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A delivery vehicle travels at 72 km/h. How many meters does it cover in 15 seconds?

A. 350 meters

B. 300 meters

C. 400 meters

D. 250 meters

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Correct Answer: Option B

Explanation:
Speed = 72 * (5/18) = 20 m/s. Distance = Speed * Time = 20 * 15 = 300 meters.

This question belongs to: Maths Time Speed and Distance

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