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September 22, 2014

September 22, 2014

Posted by **CINDY** on Thursday, December 21, 2006 at 2:21am.

Let v be the speed of the current. The boat's speed upstream (relative to the land) is 15-v and the speed downstream is 15+v. The total trip time is

35/(15-v) + 35/(15 + v) = 4.8 (hours)

Solve for the single unknown, v.

- UPSTREAM -
**Anonymous**, Saturday, September 17, 2011 at 4:16pm900

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