SOLUTION: with the aid of the current, cathy can row a boat 3 miles in 15 minutes. However, against the current she needs 20 minutes to row the same distance. How fast does Cathy row in stil
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Question 518135: with the aid of the current, cathy can row a boat 3 miles in 15 minutes. However, against the current she needs 20 minutes to row the same distance. How fast does Cathy row in still water, and how fast is the current?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
If she goes 3 miles in 15 minutes, which is 1/4 hour, she must be going 12 miles per hour. If she goes 3 miles in 20 minutes, or 1/3 hour, she must be going 9 miles per hour. Her still water speed plus the current is the downstream trip (current aided) so 
and the upstream trip is 
.
Solve the system for 
and 
John
My calculator said it, I believe it, that settles it
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