Thursday

April 17, 2014

April 17, 2014

Posted by **mo** on Saturday, September 22, 2007 at 9:54am.

Please help !!!!!!!!!!!!!!

- MaTh -
**drwls**, Saturday, September 22, 2007 at 11:18amLet V be the speed in still water, in mph. The speed with respect to land will be V-4 upstream and V+4 downstream.

Upstream travel time (in hours) = Downstream travel time + 1/3 hour.

5/(V-5) - 5/(V+5) = 1/3

Solve for V

[5(V+5) - 5(V-5)]/(V^2 -25) = 1/3

50/(V^2-25) = 1/3

150 = V^2 -25

V = sqrt 175 = 13.23 mph

**Related Questions**

algebra - Gone fishing. Debbie traveled by boat 5 miles upstream to fish in her ...

math - Debbie traveled by boat 5 miles upstream to fish in her favorite spot. ...

Math Word Problem - Debbie traveled by boat 5 miles upstream to fish in her ...

Help...More Math Help!!!...Please! - A kayaker paddled 2 hours with a 6 mph ...

Math - A boat crew rowed 20 miles downstream, with the current, in 2hours. The ...

college algebra - A boat can maintain a constant speed of 34 mph relative to the...

word problem - A motor boat took 4 hours to make a downstream trip with a ...

algebra - A motorboat can maintain a constant speed of 24 mph relative to the ...

math - A motorboat can maintain a constant speed of 16 miles per hour relative ...

math - A motorboat can maintain a constant speed of 16 miles per hour relative ...