Posted by **Anonymous** on Thursday, October 8, 2009 at 2:07pm.

Gone fishing. 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 there than to return. How

fast will her boat go in still water

- algebra -
**MathMate**, Thursday, October 8, 2009 at 3:43pm
Distance = D = 5 miles

Still water speed = S

current speed = 4 m.p.h.

Time to go upstream,T1 = 5/(S-4)

Time to go downstream, T2 = 5/(S+4)

Difference,

T1-T2 = 20/60 hour

Can you take it from here?

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