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December 20, 2014

December 20, 2014

Posted by **Chelsea** on Tuesday, December 13, 2011 at 4:50pm.

- Algebra -
**Reiny**, Tuesday, December 13, 2011 at 5:42pmspeed of freight --- x mph

speed of passenger --- x+6 mph

time to go 230 by freight = 230/x

time to go 260 by pass = 260/(x+6)

but they are equal, so

230/x = 260/(x+6)

260x = 230x + 1380

30x = 1380

x = 46

speed of freight is 46 mph , and the passenger train is 52 mph

check: 230/52 = 1/5 hrs

230/46 = 1/5 hr

all is good

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