A motorboat covers 24 km downstream in 1.5 hours and covers the same distance upstream in 3 hours. Find the speed of the boat in still water. MCQ with Answer and Explanation

A motorboat covers 24 km downstream in 1.5 hours and covers the same distance upstream in 3 hours. Find the speed of the boat in still water.
A. 12 km/h
B. 14 km/h
C. 10 km/h
D. 15 km/h
Answer: Option A
Solution (By JKSSB Mock Tests)
Downstream speed = 24 / 1.5 = 16 km/h. Upstream speed = 24 / 3 = 8 km/h. Speed in still water = (16 + 8) / 2 = 12 km/h.

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Practice More Time Speed and Distance Questions

Question #1
A train 180 meters long passes a static utility pole in 9 seconds. Find the time it takes to completely pass a platform of length 300 meters.
A. 25 seconds
B. 26 seconds
C. 24 seconds
D. 20 seconds

Correct Answer: Option C


Explanation:
Speed of train = 180 / 9 = 20 m/s. Total distance to pass platform = 180 + 300 = 480 meters. Time taken = 480 / 20 = 24 seconds.

This question belongs to: Maths Time Speed and Distance
Question #2
An emergency truck spans 450 meters in 25 seconds. Find its speed in km/h.
A. 68 km/h
B. 72 km/h
C. 60 km/h
D. 64.8 km/h

Correct Answer: Option D


Explanation:
Speed = 450 / 25 = 18 m/s. In km/h = 18 * (18/5) = 324 / 5 = 64.8 km/h.

This question belongs to: Maths Time Speed and Distance
Question #3
A field clerk walking at 5 km/h handles a regular sector. If he steps up to run at 10 km/h, he takes 24 minutes less across the course stretch. Find the absolute distance profile.
A. 4.0 km
B. 5.0 km
C. 3.5 km
D. 4.5 km

Correct Answer: Option A


Explanation:
Time difference = 24 minutes = 24/60 = 2/5 hours. Let distance be d. d / 5 - d / 10 = 2/5 => d / 10 = 2/5 => d = 4 km.

This question belongs to: Maths Time Speed and Distance