Friday

July 25, 2014

July 25, 2014

Posted by **john** on Monday, July 23, 2012 at 11:15pm.

- math -
**Reiny**, Tuesday, July 24, 2012 at 12:35amspeed of boat ---- x mph

speed downstream = x+4

speed upstream = x-4

time upstream = 24/(x-4)

time downstream = 40/(x+4)

40/(x+4)= 24/(x-4)

cross-multiply

40x - 160 = 24x + 96

16x = 256

x = 16

**Related Questions**

Math - A boat, which moves at 18 mph in still water, travels 14 miles downstream...

Algebra - A riverboat cruise line has a boat that can travel 76 mi downstream in...

Math - Brian's boat has a top speed of 9 miles per hour in still water. While ...

Algebra 2 - how would you solve: the current in the river flowed at 3 mph. The ...

math algebra - Paul Websters motorboat can travel 15 mph in still water. ...

Math - JJ's boat will go 15 mph in still water. If he can go 12 mph downstream ...

math - The speed of a stream is 6 mph. If a boat travels 52 miles downstream in ...

Intermediate Algebra Word Problem - A river's current is 4mph. A boat travels 48...

math - River Current A boat can travel 36 miles upstream in the same time that ...

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