A boat takes 2 hours to travel from point A to B in still water. To find out its

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Question
A boat takes 2 hours to travel from point A to B in still water. To find out its speed upstream, which of the following information is/are required? A. Distance between point A and B. B. Time taken to travel downstream from B to A. C. Speed of the stream of water.
Options
A. Only A and B
B. Only B and C
C. All are required
D. Any one pair of A and B, B and C or C and A is sufficient

Correct Answer

Any one pair of A and B, B and C or C and A is sufficient

Explanation

Let distance between A & B = d km
Let speed in still water = x kmph
Let speed of current = y kmph

from the given data,
d/x = 2

From A) we get d
From B) we get d/x+y
From C) we get y

So, Any one pair of A and B, B and C or C and A is sufficient to give the answer i.e, the speed of upstream.