A boatman can row 12 km/h in still water. If the river velocity index tracks at 2 km/h, find the time parameter required by the boat hull to row 40 km upstream. MCQ with Answer and Explanation

Question

A boatman can row 12 km/h in still water. If the river velocity index tracks at 2 km/h, find the time parameter required by the boat hull to row 40 km upstream.

A. 4.5 hours

B. 3.5 hours

C. 4.0 hours

D. 5.0 hours

Answer: Option C

Solution (By JKSSB Mock Tests)

Upstream speed = 12 - 2 = 10 km/h. Time required = Distance / Upstream Speed = 40 / 10 = 4 hours.

This question belongs to: Maths Time Speed and Distance

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A train passes a pedestrian standing on a platform in 6 seconds and passes the platform itself, which is 150 meters long, in 11 seconds. Find the speed of the train in km/h.

A. 108 km/h

B. 90 km/h

C. 135 km/h

D. 120 km/h

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Correct Answer: Option A

Explanation:
Time taken to cross the platform alone = 11 - 6 = 5 seconds. Speed of train = 150 / 5 = 30 m/s. In km/h = 30 * (18/5) = 108 km/h.

This question belongs to: Maths Time Speed and Distance