A boat covers 36 km downstream in 3 hours and maps the identical stretch upstream in 6 hours. Find the speed of the river stream current. MCQ with Answer and Explanation

Question

A boat covers 36 km downstream in 3 hours and maps the identical stretch upstream in 6 hours. Find the speed of the river stream current.

A. 4.0 km/h

B. 3.0 km/h

C. 3.5 km/h

D. 2.5 km/h

Answer: Option B

Solution (By JKSSB Mock Tests)

Downstream speed = 36 / 3 = 12 km/h. Upstream speed = 36 / 6 = 6 km/h. Speed of stream current = (12 - 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 cyclist covers 500 meters in exactly 1 minute 40 seconds. Find his speed in km/h.

A. 18 km/h

B. 20 km/h

C. 22 km/h

D. 15 km/h

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option A

Explanation:
Time = 1 minute 40 seconds = 100 seconds. Speed = 500 / 100 = 5 m/s. In km/h = 5 * (18/5) = 18 km/h.

This question belongs to: Maths Time Speed and Distance

Question #2

Share Report

A boat can row 12 km/h in still water. If the current marks 3 km/h, find the distance covered downstream by the boat in exactly 40 minutes.

A. 11 km

B. 12 km

C. 9 km

D. 10 km

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option D

Explanation:
Downstream speed = 12 + 3 = 15 km/h. Time = 40 minutes = 40/60 = 2/3 hours. Distance = Speed * Time = 15 * (2/3) = 10 km.

This question belongs to: Maths Time Speed and Distance

Question #3

Share Report

A train 130 meters long passing a platform 170 meters long takes 15 seconds. Find the speed of the train in km/h.

A. 84 km/h

B. 72 km/h

C. 64 km/h

D. 80 km/h

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option B

Explanation:
Total distance = 130 + 170 = 300 meters. Speed = 300 / 15 = 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