SOLUTION: Debbie traveled by boat 5 miles upstream to fish in her favorite spot. Because of the 4-mph current, it took her 20 minutes longer to get their than to return. How fast will her bo
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-> SOLUTION: Debbie traveled by boat 5 miles upstream to fish in her favorite spot. Because of the 4-mph current, it took her 20 minutes longer to get their than to return. How fast will her bo
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Question 172553: Debbie traveled by boat 5 miles upstream to fish in her favorite spot. Because of the 4-mph current, it took her 20 minutes longer to get their than to return. How fast will her boat go in still water? Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! Let = her speed in still water
Let = the speed of the current
Let = the distance she has to go
Let = time going upstream in hrs
Let = time going downstream in hrs
Then = speed of boat going upstream = speed of boat going downstream
----------------
The problem says mi/hr mi
---------------- going upstream
and, going downstream
Substitute this into the upstream equation
Multiply both sides by mi/hr
The speed of the boat in still water is 11.662 mi/hr
check answer: hrs hrs going upstream close enough
also close enough
