A boat moves upstream at 9 km/h and downstream at 15 km/h. Find the speed of the boat in still water. MCQ with Answer and Explanation

A boat moves upstream at 9 km/h and downstream at 15 km/h. Find the speed of the boat in still water.
A. 13 km/h
B. 11 km/h
C. 12 km/h
D. 14 km/h
Answer: Option C
Solution (By JKSSB Mock Tests)
Speed in still water = (Downstream speed + Upstream speed) / 2 = (15 + 9) / 2 = 12 km/h.

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Practice More Time Speed and Distance Questions

Question #1
A vehicle runs at an average speed of 54 km/h. It wraps the first half of the trip duration in 2 hours and the second half duration at 66 km/h. Find the time spent on the second half duration.
A. 3 hours
B. 2 hours
C. 1.5 hours
D. 2.5 hours

Correct Answer: Option B


Explanation:
Since it specifies 'half of the trip duration', the time for both halves is identical. Time spent on the second half is equal to the first half, which is 2 hours.

This question belongs to: Maths Time Speed and Distance
Question #2
A boat moves upstream at a pace of 10 km/h and handles downstream at 16 km/h. Find the speed of the river current.
A. 3.5 km/h
B. 2.5 km/h
C. 3.0 km/h
D. 4.0 km/h

Correct Answer: Option C


Explanation:
Speed of river current = (Downstream speed - Upstream speed) / 2 = (16 - 10) / 2 = 6 / 2 = 3 km/h.

This question belongs to: Maths Time Speed and Distance
Question #3
A car covers a distance of 300 km at a uniform speed. If the speed is scaled up by 15 km/h, the trip takes exactly 4 hours. Find the original speed.
A. 60 km/h
B. 55 km/h
C. 65 km/h
D. 70 km/h

Correct Answer: Option A


Explanation:
New speed = 300 / 4 = 75 km/h. Since new speed is original speed + 15 km/h, original speed = 75 - 15 = 60 km/h.

This question belongs to: Maths Time Speed and Distance