A boatman rows 24 km downstream and 12 km upstream, taking 2 hours for each leg of the journey. Find the speed of the boat in still water. MCQ with Answer and Explanation

A boatman rows 24 km downstream and 12 km upstream, taking 2 hours for each leg of the journey. Find the speed of the boat in still water.
A. 9 km/h
B. 11 km/h
C. 8 km/h
D. 10 km/h
Answer: Option A
Solution (By JKExamLibrary)
Downstream speed = 24 / 2 = 12 km/h. Upstream speed = 12 / 2 = 6 km/h. Speed in still water = (12 + 6) / 2 = 9 km/h.

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Practice More Time Speed and Distance Questions

Question #1
A bus moving at 42 km/h covers a distance in 8 hours. At what speed must it travel to cover the same distance in 6 hours?
A. 56 km/h
B. 60 km/h
C. 64 km/h
D. 52 km/h

Correct Answer: Option A


Explanation:
Distance = 42 * 8 = 336 km. Required speed = 336 / 6 = 56 km/h.

This question belongs to: Maths Time Speed and Distance
Question #2
A baseline boat hull can row 10 km/h in still water. If the river current tracks a velocity of 2 km/h, find the exact sector distance covered downstream by the boat hull in 30 minutes flat.
A. 6 km
B. 8 km
C. 5 km
D. 7 km

Correct Answer: Option A


Explanation:
Downstream speed = 10 + 2 = 12 km/h. Time = 30 minutes = 0.5 hour. Distance covered = Speed * Time = 12 * 0.5 = 6 km.

This question belongs to: Maths Time Speed and Distance
Question #3
A train passes a standing man in 10 seconds and a platform 300 meters long in 25 seconds. Find the length of the train.
A. 150 meters
B. 200 meters
C. 300 meters
D. 250 meters

Correct Answer: Option A


Explanation:
The train takes 25 - 10 = 15 seconds to cover the length of the platform. Speed of the train = 300 / 15 = 20 m/s. Length of the train = Speed * Time to cross the man = 20 * 10 = 150 meters.

This question belongs to: Maths Time Speed and Distance