A boat crew rows 30 km upstream and 50 km downstream, taking exactly 5 hours for each independent passage. Find the speed of the current stream. MCQ with Answer and Explanation

Question

A boat crew rows 30 km upstream and 50 km downstream, taking exactly 5 hours for each independent passage. Find the speed of the current stream.

A. 1.5 km/h

B. 2.5 km/h

C. 2 km/h

D. 3 km/h

Answer: Option C

Solution (By JKSSB Mock Tests)

Upstream speed = 30 / 5 = 6 km/h. Downstream speed = 50 / 5 = 10 km/h. Speed of current stream = (Downstream speed - Upstream speed) / 2 = (10 - 6) / 2 = 2 km/h.

This question belongs to: Maths Time Speed and Distance

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A distance of 600 km is covered by a passenger train in 12 hours. If the speed of an express train is 20 km/h more than that of the passenger train, how much less time will the express train take to cover the same distance?

A. 2 hours

B. 3 hours

C. 4 hours

D. 3.4 hours

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Correct Answer: Option D

Explanation:
Speed of passenger train = 600 / 12 = 50 km/h. Speed of express train = 50 + 20 = 70 km/h. Time taken by express train = 600 / 70 = 8.57 hours (approx 8 hours 34 minutes). Time saved = 12 - 8.57 = 3.43 hours.

This question belongs to: Maths Time Speed and Distance