<PRE><B>Question 924356</B>
x = boat speed = 6 mph
y = current speed
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s = d/t
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up:
x - y = 10/t
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down:
x + y = 30/t
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x - y = 10/t
y = x - 10/t
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x + y = 30/t
y = 30/t - x
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y = x - 10/t
y = 30/t - x
x - 10/t = 30/t - x
2x = 40/t
x = 20/t
6 = 20/t
t = 20/6
t = 10/3
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answer:
y = x - 10/t
y = 6 - 10/(10/3)
y = 6 - 3
y = current speed = 3 mph
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