QA – Placement Quizzes | Trains, Boats and Streams | Question 4

Peter’s speedboat run at a speed of 9 km/h in still water. He rows to a place at a distance of 105 km and comes back to the starting point. If the speed of stream is 1.5 km/h, find out the time taken by Peter.
(A) 24 h
(B) 21 h
(C) 23 h
(D) 22 h


Answer: (A)

Explanation: Upstream speed = 9 – 1.5 = 7.5 km/h.
Downstream speed = 9 + 1.5 = 10.5 km/h.
Therefore, time taken = 105/7.5 + 105/10.5 = 14 + 10 = 24 h.

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