A boat goes 24 km upstream and 28 km downstream in 6 hrs. It goes 30 km upstream and 21 km downstream in 6-hrs. Find the speed of the boat in still water and also speed of the stream.
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let the speed of stream = x km/ h
speed in downstream = x+21 in
speed in upstream= x-30
time= 6 hrs
1/x+21 - 1/x-30 = 6
solve it you definitely get the answer
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