A swimmer can traverse 36 km downstream in 3 hours and covers 12 km upstream in 3 hours. Find the swimmer's baseline speed in still water. MCQ with Answer and Explanation

Question

A swimmer can traverse 36 km downstream in 3 hours and covers 12 km upstream in 3 hours. Find the swimmer's baseline speed in still water.

A. 10 km/h

B. 9 km/h

C. 7 km/h

D. 8 km/h

Answer: Option D

Solution (By JKSSB Mock Tests)

Downstream speed = 36 / 3 = 12 km/h. Upstream speed = 12 / 3 = 4 km/h. Speed in still water = (12 + 4) / 2 = 16 / 2 = 8 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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Excluding stoppages, a truck travels at 90 km/h and including stoppages it travels at 75 km/h. How many minutes does the truck stop per hour?

A. 15 minutes

B. 10 minutes

C. 8 minutes

D. 12 minutes

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Correct Answer: Option B

Explanation:
Stoppage time per hour = (90 - 75) / 90 = 15 / 90 = 1/6 hour. In minutes = (1/6) * 60 = 10 minutes.

This question belongs to: Maths Time Speed and Distance

Question #2

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A car covers a distance of 360 km in 4 hours 30 minutes. Find its average speed.

A. 80 km/h

B. 85 km/h

C. 90 km/h

D. 75 km/h

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Correct Answer: Option A

Explanation:
Time = 4.5 hours. Speed = Distance / Time = 360 / 4.5 = 80 km/h.

This question belongs to: Maths Time Speed and Distance

Question #3

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A motor car finishes a journey in 6 hours. It covers the first half of the distance at 40 km/h and the second half at 20 km/h. Find the total distance covered.

A. 180 km

B. 140 km

C. 160 km

D. 200 km

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Correct Answer: Option C

Explanation:
Let the half distance be d. d / 40 + d / 20 = 6 => 3d / 40 = 6 => 3d = 240 => d = 80 km. Total distance = 2d = 160 km.

This question belongs to: Maths Time Speed and Distance

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