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speed of water = x
speed of stream =y
speed upstream = x - y
speed downstream = x+ y
time = distance / speed
30/x-y + 28/x+y = 7 -------equation1
21/x-y + 21/ x+y + 5 --------equation 2
SOLVE equation1 AND equation 2 TO GET x AND y by takind 1/x-y as v and 1/x+y as u
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