Hasan rows 36 km with the stream in 6 h and 40 km against the stream in 8 h. Speed of boat in still water is

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Solution

Let speed of boat in still water be x km/h and speed of stream is y km/h.
$\frac{36}{x + y} = 6$
$x + y = 6$ .........(1)
$\frac{40}{x - y} = 8$
$x - y = 5$ ..........(2)
On solving equations 1 and 2, we get,
$x = 6.5 k m / h$

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