A boat can row 12 km/h in still water. If the river current flows at 3 km/h, find the time taken to row 45 km downstream. MCQ with Answer and Explanation

Question

A boat can row 12 km/h in still water. If the river current flows at 3 km/h, find the time taken to row 45 km downstream.

A. 3 hours

B. 2.5 hours

C. 3.5 hours

D. 4 hours

Answer: Option A

Solution (By JKSSB Mock Tests)

Downstream speed = 12 + 3 = 15 km/h. Time taken = Distance / Downstream speed = 45 / 15 = 3 hours.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A marathon runner runs a distance of 42 km at a uniform speed of 12 km/h. What is the time taken to finish the race?

A. 3 hours 30 minutes

B. 3 hours 20 minutes

C. 4 hours

D. 3 hours 45 minutes

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Correct Answer: Option A

Explanation:
Time = Distance / Speed = 42 / 12 = 3.5 hours = 3 hours 30 minutes.

This question belongs to: Maths Time Speed and Distance

Question #2

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A runner completes a 200-meter race in 25 seconds. Find his speed in km/h.

A. 30 km/h

B. 24 km/h

C. 32.4 km/h

D. 28.8 km/h

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Correct Answer: Option D

Explanation:
Speed in m/s = 200 / 25 = 8 m/s. In km/h = 8 * (18/5) = 144 / 5 = 28.8 km/h.

This question belongs to: Maths Time Speed and Distance

Question #3

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A car travels from A to B at 45 km/h and returns to A at 55 km/h. What is the approximate average speed for the round journey?

A. 49.5 km/h

B. 50.0 km/h

C. 48.2 km/h

D. 51.4 km/h

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Correct Answer: Option A

Explanation:
Average Speed = 2xy / (x + y) = (2 * 45 * 55) / (45 + 55) = 4950 / 100 = 49.5 km/h.

This question belongs to: Maths Time Speed and Distance

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