A boat covers 50 kms upstream and 70 kms downstream in 4 hour. It can also covers 35 kms downstream and 75 kms upstream in 4 hour. Find the speed of the boat in still water and that of the stream
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Answer:
speed of boat = x
speed of steam = y
x + y = 70
x-y = 35
x = 60
y = 10
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