# QA – Placement Quizzes | Trains, Boats and Streams | Question 3

A boat runs at the speed of 13 km/h in still water. If the speed of the stream is 4 km/h, how much time will it take to go 68 km downstream?**(A)** 5 h**(B)** 4 h**(C)** 6 h**(D)** 3 h**Answer:** **(B)****Explanation:** Speed of the boat downstream = 13 + 4 = 17 km/h.

Therefore, time taken to go 68 km downstream = (68/17) = 4 h.

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