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The rate of a stream is 4 kmph. A boat goes 6 km and back to the starting point in 2 hours. What is the speed of the boat in still water?

A.	3 kmph	B.	4 kmph
C.	10 kmph	D.	8 kmph

Answer and Explanation

Answer:8 kmph

Explanation:
Let the speed of the boat in still water be x kmph.
=> Speed downstream = (x + 4) kmph, Speed upstream = (x – 4) kmph
=> Time taken to go 6 km downstream = 6/(x -4), time taken to go
=> 6 km upstream = 6/(x – 4) * 6/(x +4) + 6/ (x – 4) = 2 hours.
Solving the equations x = 8

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