A man rows a boat 20 km downstream in 2 hours and returns upstream in 5 hours. Find the speed of the stream. MCQ with Answer and Explanation

A man rows a boat 20 km downstream in 2 hours and returns upstream in 5 hours. Find the speed of the stream.
A. 2.5 km/h
B. 3.0 km/h
C. 3.5 km/h
D. 4.0 km/h
Answer: Option B
Solution (By JKSSB Mock Tests)
Downstream speed = 20 / 2 = 10 km/h. Upstream speed = 20 / 5 = 4 km/h. Speed of stream = (10 - 4) / 2 = 6 / 2 = 3 km/h.

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Practice More Time Speed and Distance Questions

Question #1
Two trains start from stations A and B and travel towards each other at speeds of 50 km/h and 60 km/h respectively. At the time of their meeting, the second train has traveled 120 km more than the first. Find the distance between A and B.
A. 1440 km
B. 1500 km
C. 1320 km
D. 1200 km

Correct Answer: Option C


Explanation:
Let the time they travel before meeting be t hours. Distance difference = 60t - 50t = 10t = 120 km => t = 12 hours. Total distance = (50 + 60) * t = 110 * 12 = 1320 km.

This question belongs to: Maths Time Speed and Distance
Question #2
Two cars start from the same place at the same time in the same direction. The first car runs at a constant speed of 50 km/h and the second car runs at 60 km/h. What is the distance between them after 3 hours 30 minutes?
A. 35 km
B. 40 km
C. 30 km
D. 45 km

Correct Answer: Option A


Explanation:
Relative speed = 60 - 50 = 10 km/h. Time = 3.5 hours. Distance between them = Relative Speed * Time = 10 * 3.5 = 35 km.

This question belongs to: Maths Time Speed and Distance
Question #3
A man walks a certain distance at a speed of 4 km/h and runs back at 16 km/h. Find his average speed.
A. 9.6 km/h
B. 10 km/h
C. 6.4 km/h
D. 8 km/h

Correct Answer: Option C


Explanation:
Average Speed = (2 * 4 * 16) / (4 + 16) = 128 / 20 = 6.4 km/h.

This question belongs to: Maths Time Speed and Distance