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December 20, 2014

December 20, 2014

Posted by **karon** on Thursday, March 29, 2012 at 1:07pm.

- algebra 2 -
**Reiny**, Thursday, March 29, 2012 at 4:14pmspeed of train B --- x mph

speed of train A --- x - 18 mph

for A: time to go 190 miles = 190/(x-18)

for B: time to go 280 miles = 280/x

but these two times are equal, so ....

190/(x-18) = 280/x

280x - 5040 = 190x

70x = 5040

x = 72

take it from there

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