A boat can row 13 km/h in still water and the speed of the current is 3 km/h. Find the time taken to row 48 km downstream. MCQ with Answer and Explanation

Question

A boat can row 13 km/h in still water and the speed of the current is 3 km/h. Find the time taken to row 48 km downstream.

A. 3.5 hours

B. 3.0 hours

C. 4.0 hours

D. 2.5 hours

Answer: Option B

Solution (By JKSSB Mock Tests)

Downstream speed = 13 + 3 = 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 person covers a distance of 12 km in 1 hour 30 minutes. What is his speed in meters per second?

A. 2.00 m/s

B. 2.50 m/s

C. 2.22 m/s

D. 2.77 m/s

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Correct Answer: Option C

Explanation:
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

Question #2

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A dog sees a cat at a distance of 150 meters. The cat starts running at 12 km/h and the dog chases it at 15 km/h. How much distance will the cat cover before being caught?

A. 600 meters

B. 900 meters

C. 500 meters

D. 750 meters

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Correct Answer: Option A

Explanation:
Relative speed = 15 - 12 = 3 km/h = 3 * (5/18) = 5/6 m/s. Time to catch = 150 / (5/6) = 180 seconds. Distance covered by cat = Speed of cat * Time = (12 * 5/18) * 180 = (10/3) * 180 = 600 meters.

This question belongs to: Maths Time Speed and Distance