A boat moves upstream at 6 km/h and downstream at 12 km/h. Find the speed of the river current. MCQ with Answer and Explanation

A boat moves upstream at 6 km/h and downstream at 12 km/h. Find the speed of the river current.
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)
Speed of the river current = (Downstream speed - Upstream speed) / 2 = (12 - 6) / 2 = 6 / 2 = 3 km/h.

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Practice More Time Speed and Distance Questions

Question #1
An airplane spans a distance of 1800 km at a uniform speed of 600 km/h. Find the time taken to complete the trip.
A. 2 hours
B. 2.5 hours
C. 3 hours
D. 3.5 hours

Correct Answer: Option C


Explanation:
Time = Distance / Speed = 1800 / 600 = 3 hours.

This question belongs to: Maths Time Speed and Distance
Question #2
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. 1320 km
B. 1500 km
C. 1200 km
D. 1440 km

Correct Answer: Option A


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 #3
A person can row 12 km/h in still water. If the speed of the river current is 4 km/h, find the time taken to row 32 km upstream.
A. 4 hours
B. 6 hours
C. 5 hours
D. 3 hours

Correct Answer: Option A


Explanation:
Upstream speed = 12 - 4 = 8 km/h. Time taken = 32 / 8 = 4 hours.

This question belongs to: Maths Time Speed and Distance