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

Question

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. 2.5 km/h

B. 2.2 km/h

C. 1.8 km/h

D. 2.0 km/h

Answer: Option D

Solution (By JKSSB Mock Tests)

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

Request complete Subject PDF

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Time Speed and Distance Questions

Question #1

Share Report

A man can row 8 km/h in still water. If the river is running at 4 km/h, it takes him 6 hours to row to a place and back. How far is the place?

A. 20 km

B. 16 km

C. 18 km

D. 24 km

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option C

Explanation:
Downstream speed = 8 + 4 = 12 km/h. Upstream speed = 8 - 4 = 4 km/h. Let distance be d. d/12 + d/4 = 6 => 4d/12 = 6 => d/3 = 6 => d = 18 km.

This question belongs to: Maths Time Speed and Distance

Question #2

Share Report

A boat crew row a boat 24 km downstream in 3 hours and tracks the identical loop back upstream in 6 hours. Find the baseline speed of the boat in still water.

A. 5 km/h

B. 7 km/h

C. 6 km/h

D. 8 km/h

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option C

Explanation:
Downstream tracking speed = 24 / 3 = 8 km/h. Upstream tracking speed = 24 / 6 = 4 km/h. Speed in still water = (8 + 4) / 2 = 12 / 2 = 6 km/h.

This question belongs to: Maths Time Speed and Distance

Question #3

Share Report

Two points A and B are 260 km apart. Train P leaves A for B at 50 km/h at 9:00 AM. Train Q leaves B for A at 60 km/h at 10:00 AM. At what time will they cross each other?

A. 11:54 AM

B. 12:00 PM

C. 11:36 AM

D. 12:12 PM

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option A

Explanation:
By 10:00 AM, Train P covers 50 km. Remaining distance = 260 - 50 = 210 km. Relative speed = 50 + 60 = 110 km/h. Time = 210 / 110 = 1.9 hours. Let's adjust parameters for perfect integer meeting time: distance 270 km, 270-50 = 220 km. 220 / 110 = 2 hours. Meeting time = 10:00 AM + 2 hours = 12:00 PM. Correct answer matches Option C if distance is 270 km.

This question belongs to: Maths Time Speed and Distance

Explore All Time Speed and Distance MCQs