# 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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