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

Two trains heading toward each other are 400 miles apart. One train travels 15 miles per hour faster than the other train. If they arrive at the same station in 5 hours, how fast is each train traveling?

time = 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

100

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