d = 4 miles both ways

Down stream

4 = (x+y)*1 hour

x = 4 - y

Upstream

4 = (x-y)*2 hour

4 = 2x - 2y

4 = 2(4-y) - 2y

4 = 8 - 2y - 2y

-4 = - 4y

y = 1 mile/ hour

x = 4 - 1 = 3 miles/hour

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