A boat can row 14 km/h in still water and the speed of the current is 2 km/h. Find the time taken to row 48 km downstream. MCQ with Answer and Explanation

Question

A boat can row 14 km/h in still water and the speed of the current is 2 km/h. Find the time taken to row 48 km downstream.

A. 3.0 hours

B. 4.0 hours

C. 2.5 hours

D. 3.5 hours

Answer: Option A

Solution (By JKSSB Mock Tests)

Downstream speed = 14 + 2 = 16 km/h. Time taken = 48 / 16 = 3 hours.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A train 100 meters long running at 90 km/h crosses another train 150 meters long running at 54 km/h in the same direction. How much time do they take to cross each other?

A. 20 seconds

B. 35 seconds

C. 30 seconds

D. 25 seconds

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Correct Answer: Option D

Explanation:
Total distance = 100 + 150 = 250 meters. Relative speed in same direction = 90 - 54 = 36 km/h = 36 * (5/18) = 10 m/s. Time taken = 250 / 10 = 25 seconds.

This question belongs to: Maths Time Speed and Distance

Question #2

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A wheel of diameter 70 cm makes 400 revolutions per minute. Find the speed of the vehicle in km/h.

A. 52.8 km/h

B. 48.2 km/h

C. 55.4 km/h

D. 60.0 km/h

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Correct Answer: Option A

Explanation:
Radius r = 35 cm = 0.35 meters. Circumference = 2 * (22/7) * 0.35 = 2.2 meters. Distance covered in 1 minute = 400 * 2.2 = 880 meters. Distance covered in 1 hour = 880 * 60 = 52800 meters = 52.8 km. Speed = 52.8 km/h.

This question belongs to: Maths Time Speed and Distance