SOLUTION: A boat traveled 210 miles downstream then 210 miles back upstream. The trip downstream took 10 hours. The trip back took 70 hours. What is the speed of the boat in still water? Wha

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Question 1125519: A boat traveled 210 miles downstream then 210 miles back upstream. The trip downstream took 10 hours. The trip back took 70 hours. What is the speed of the boat in still water? What is the speed of the current ? The speed of the current is how many miles per hour? The speed of the boat in still water is how many miles per hour?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
x, boat speed when no current
y, speed of current

system%28x%2By=210%2F10%2Cx-y=210%2F70%29

system%28x%2By=21%2Cx-y=3%29

2x=24
x=12
-
x%2By-x-%28-y%29=21-3
2y=18
y=9
...

x=12------boat speed without current
y=9------speed of the current