A boat covers 20 km downstream in 2 hours and the same distance upstream in 5 hours. Find the speed of the stream. MCQ with Answer and Explanation

Question

Share Report Error

A boat covers 20 km downstream in 2 hours and the same distance upstream in 5 hours. Find the speed of the stream.

A. 4.0 km/h

B. 2.5 km/h

C. 3.0 km/h

D. 3.5 km/h

Answer: Option C

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.

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 sound wave travels at a speed of 340 m/s. Find the distance covered by the wave in 10 seconds.

A. 3.4 km

B. 3.8 km

C. 3.6 km

D. 3.2 km

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option A

Explanation:
Distance = Speed * Time = 340 * 10 = 3400 meters = 3.4 km.

This question belongs to: Maths Time Speed and Distance

Question #2

Share Report

A student walking at 3 km/h reaches his school 15 minutes late. If he walks at 4 km/h, he reaches 15 minutes early. Find the distance.

A. 5 km

B. 6 km

C. 8 km

D. 4 km

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option B

Explanation:
Time difference = 15 - (-15) = 30 minutes = 0.5 hours. Let distance be d. d/3 - d/4 = 0.5 => d/12 = 0.5 => d = 6 km.

This question belongs to: Maths Time Speed and Distance

Question #3

Share Report

A locomotive train 140 meters long passes a track milestone pole in 7 seconds flat. What is its speed in km/h?

A. 68 km/h

B. 76 km/h

C. 72 km/h

D. 80 km/h

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option C

Explanation:
Speed of train = 140 / 7 = 20 m/s. In km/h = 20 * (18/5) = 72 km/h.

This question belongs to: Maths Time Speed and Distance

Explore All Time Speed and Distance MCQs