A modern speedboat records a speed of 18 km/h in still water. It spans a specific upstream reach in 5 hours. If the current velocity is 4 km/h, find the reach distance. MCQ with Answer and Explanation

Question

A modern speedboat records a speed of 18 km/h in still water. It spans a specific upstream reach in 5 hours. If the current velocity is 4 km/h, find the reach distance.

A. 80 km

B. 75 km

C. 70 km

D. 65 km

Answer: Option C

Solution (By JKSSB Mock Tests)

Upstream speed = 18 - 4 = 14 km/h. Distance covered = Upstream speed * Time = 14 * 5 = 70 km.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A standard boat can row 12 km/h in still water. If the speed of the current is 2 km/h, find the time required to log 30 km upstream.

A. 4.0 hours

B. 3.5 hours

C. 3.0 hours

D. 2.5 hours

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Correct Answer: Option C

Explanation:
Upstream speed = 12 - 2 = 10 km/h. Time required = Distance / Upstream speed = 30 / 10 = 3 hours.

This question belongs to: Maths Time Speed and Distance

Question #2

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Two trains 110 meters and 90 meters long are running in opposite directions at speeds of 36 km/h and 54 km/h respectively. In what time will they pass each other completely?

A. 6 seconds

B. 12 seconds

C. 8 seconds

D. 10 seconds

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Correct Answer: Option C

Explanation:
Total distance = 110 + 90 = 200 meters. Relative speed in opposite directions = 36 + 54 = 90 km/h = 90 * (5/18) = 25 m/s. Time taken = 200 / 25 = 8 seconds.

This question belongs to: Maths Time Speed and Distance