Entry Test MCQ :: Boat and Stream Questions

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A man travel in his yacht downstream at d knots and returns the same distance upstream at u knots. What is his average rate for the round trip if the length of stream is 1:

[A].	du/21	[B].	dtu/21
[C].	Idu/(d+2)	[D].	2du/(d+u)

Answer: Option D

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