SOLUTION: A goes down river 9 miles, then back upriver for 3 miles. Rate of river current is 6 mph. How long does it take A to go the 12 miles? I have 9/x-6 for time downstream, and 3/x-6
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Question 674338: A goes down river 9 miles, then back upriver for 3 miles. Rate of river current is 6 mph. How long does it take A to go the 12 miles? I have 9/x-6 for time downstream, and 3/x-6 for time upstream, but don't know how to set up the equation. (Answer is 1 hour.)
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
let = A's rate in still water ( no current )
Going downstream, his rate is
Going upstream, his rate is
---------------
Going downstream,
Going upstream,
-------------------
You need to find
--------------------
I think you're missing his rate in still water
Can't solve without it.
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