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July 30, 2014

July 30, 2014

Posted by **stephanie** on Thursday, August 9, 2012 at 11:13pm.

- math -
**Steve**, Friday, August 10, 2012 at 5:11amtime = distance over speed

since the time is the same for both trains, and their combined distance is 400,

d/s = (400-d)/(s+15) = 5

d = 5s, so

(400-5s)/(s+15) = 5

s = 32.5

d = 162.5

check: 162.5/32.5 = 5

237.5/47.5 = 5

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