SOLUTION: A boat can travel 16 mph in still water. It can make the trip upstream to a marina in 20 minutes and can return to its starting point in 15 minutes. What is the speed of the curren

Question 828710: A boat can travel 16 mph in still water. It can make the trip upstream to a marina in 20 minutes and can return to its starting point in 15 minutes. What is the speed of the current ?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
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s = d/t
d = s*t
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up:
d = (16 - x)20/60
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down:
d = (16 + x)15/60
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(16 - x)1/3 = (16 + x)1/4
(16 - x)4 = (16 + x)3
64 - 4x = 48 + 3x
7x = 16
x = 16/7
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speed of current: 2.3 mph
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