A boat goes 30km upstream and 28km downstream in 10 hours. In 7 hours, it
can go 21 km upstream and 21 km downstream then to return downstream to
the same spot. Find the speed of stream and that of the boat in still water and
speed of the stream.
NOTE:- It is 10 hours for first equation and 7 hours for second equation.
Don't get confused between with the another question like this
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speed of the boat in still water is 128 / 21 km/hr and speed of stream current is 16 / 9 km/hr
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