A boat can row 18 km/h in still water and the speed of the current is 2 km/h. Find the time taken to row 80 km downstream. MCQ with Answer and Explanation

Question

A boat can row 18 km/h in still water and the speed of the current is 2 km/h. Find the time taken to row 80 km downstream.

A. 4.5 hours

B. 5.0 hours

C. 4.0 hours

D. 3.5 hours

Answer: Option C

Solution (By JKSSB Mock Tests)

Downstream speed = 18 + 2 = 20 km/h. Time taken = 80 / 20 = 4 hours.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A train 240 meters long passes a static utility pole in 12 seconds. Find the time it takes to completely pass a platform of length 360 meters.

A. 32 seconds

B. 35 seconds

C. 30 seconds

D. 26 seconds

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Correct Answer: Option C

Explanation:
Speed of train = 240 / 12 = 20 m/s. Total distance to pass platform = 240 + 360 = 600 meters. Time taken = 600 / 20 = 30 seconds.

This question belongs to: Maths Time Speed and Distance

Question #2

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A boat can row 10 km/h in still water and the river current marks 4 km/h. Find the time required to complete 42 km downstream.

A. 3.0 hours

B. 3.5 hours

C. 4.0 hours

D. 2.5 hours

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Correct Answer: Option A

Explanation:
Downstream speed = 10 + 4 = 14 km/h. Time taken = Distance / Downstream speed = 42 / 14 = 3 hours.

This question belongs to: Maths Time Speed and Distance

Question #3

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A motorboat registers a speed of 14 km/h in still water. If the river current tracks at 2 km/h, find the duration required to complete a 48 km downstream course.

A. 4 hours

B. 3 hours

C. 3.5 hours

D. 2.5 hours

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Correct Answer: Option B

Explanation:
Downstream speed = 14 + 2 = 16 km/h. Time taken = Distance / Downstream speed = 48 / 16 = 3 hours.

This question belongs to: Maths Time Speed and Distance

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