A man rows a distance of 12 km downstream in 1.5 hours and returns upstream in 3 hours. Find the speed of the river current. MCQ with Answer and Explanation

A man rows a distance of 12 km downstream in 1.5 hours and returns upstream in 3 hours. Find the speed of the river current.
A. 2.2 km/h
B. 1.8 km/h
C. 2.5 km/h
D. 2.0 km/h
Answer: Option D
Solution (By JKExamLibrary)
Downstream speed = 12 / 1.5 = 8 km/h. Upstream speed = 12 / 3 = 4 km/h. Speed of current = (8 - 4) / 2 = 4 / 2 = 2 km/h.

This question belongs to: Maths Time Speed and Distance

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Practice More Time Speed and Distance Questions

Question #1 Report Error
A container ship routes a distance of 120 nautical miles at a speed of 15 knots (nautical miles per hour). Find the total time of the passage.
A. 8 hours
B. 10 hours
C. 12 hours
D. 6 hours

Correct Answer: Option A


Explanation:
Time = Distance / Speed = 120 / 15 = 8 hours.

This question belongs to: Maths Time Speed and Distance
Question #2 Report Error
A passenger coach locomotive 120 meters long passes a clear roadside post marker in 6 seconds flat. Find the time needed to cross an extensions platform 240 meters long.
A. 20 seconds
B. 22 seconds
C. 18 seconds
D. 15 seconds

Correct Answer: Option C


Explanation:
Speed of coach locomotive = 120 / 6 = 20 m/s. Total distance to clear platform stretch = 120 + 240 = 360 meters. Time required = 360 / 20 = 18 seconds.

This question belongs to: Maths Time Speed and Distance
Question #3 Report Error
A train 120 meters long passes an active crossing signal point in 6 seconds flat. Find the time interval needed to clear a station platform 240 meters long.
A. 18 seconds
B. 15 seconds
C. 22 seconds
D. 20 seconds

Correct Answer: Option A


Explanation:
Speed of train = 120 / 6 = 20 m/s. Total distance to clear platform = 120 + 240 = 360 meters. Time required = 360 / 20 = 18 seconds.

This question belongs to: Maths Time Speed and Distance