The speed of a boat in still water is 14 km/h and the speed of the current is 4 km/h. How much distance can the boat cover upstream in 2 hours? MCQ with Answer and Explanation

Question

The speed of a boat in still water is 14 km/h and the speed of the current is 4 km/h. How much distance can the boat cover upstream in 2 hours?

A. 20 km

B. 18 km

C. 22 km

D. 24 km

Answer: Option A

Solution (By JKSSB Mock Tests)

Upstream speed = 14 - 4 = 10 km/h. Distance covered in 2 hours = 10 * 2 = 20 km.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A train running at 90 km/h overtakes a cyclist riding at 18 km/h in the same direction in 10 seconds. Find the length of the train.

A. 240 meters

B. 200 meters

C. 220 meters

D. 180 meters

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Correct Answer: Option B

Explanation:
Relative speed = 90 - 18 = 72 km/h = 72 * (5/18) = 20 m/s. Length of train = Relative speed * Time = 20 * 10 = 200 meters.

This question belongs to: Maths Time Speed and Distance

Question #2

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A train 180 meters long running at 54 km/h passes a stationary point tracking observer. Find the time parameter required to cross.

A. 12 seconds

B. 16 seconds

C. 10 seconds

D. 14 seconds

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Correct Answer: Option A

Explanation:
Speed of train = 54 * (5/18) = 15 m/s. Time taken = 180 / 15 = 12 seconds.

This question belongs to: Maths Time Speed and Distance

Question #3

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A train 120 meters long passes a pole in 6 seconds. What is the speed of the train in km/h?

A. 84 km/h

B. 64 km/h

C. 80 km/h

D. 72 km/h

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Correct Answer: Option D

Explanation:
Speed of train = 120 / 6 = 20 m/s. In km/h = 20 * (18/5) = 72 km/h.

This question belongs to: Maths Time Speed and Distance

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