A boat goes 24 km upstream and 28 km downstream in 6 hrs.it goes 30 km upstream and 21km downstream in 6.5 hrs.find speed of boat in still water and also speed of stream.
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You can consider the boat speed as x and stream speed as y.
You can consider the following equations which is 24/(x-y) + 28/(x+y) = 6 and 30/(x-y) + 21/(x+y) = 6.5.
You can take 1/(x-y) as X and 1/(x+y) as Y.
After solving, we get x = 1/6 as well as y=1/14.
Therefore, the value of x is 10 kmph and y is 4kmph.
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