SOLUTION: A sailboat can travel 60 miles, upstream in the same time it takes to travel 100 miles downstream. If the speed of the boast in still water is 20 miles per hour, what is the speed

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Question 66037This question is from textbook An Incremental Development
: A sailboat can travel 60 miles, upstream in the same time it takes to travel 100 miles downstream. If the speed of the boast in still water is 20 miles per hour, what is the speed of the current? This question is from textbook An Incremental Development

Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
60/(20-X)=100/(20+X)
100(20-X)=60(20+X)
2000-100X=1200+60X
-100X-60X=1200-2000
-160X=-800
X=-800/-160
X=5 MPH FOR THE CURRENT
PROOF
60/(20-5)=100/(20+5)
60/15=100/25
4=4