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April 18, 2015

April 18, 2015

Posted by **Chloe** on Saturday, January 30, 2010 at 2:56pm.

- Algebra -
**drwls**, Saturday, January 30, 2010 at 3:30pmWhen train B passes, train A is ahead by 40 miles/hr x (0.2 hr) = 8 miles.

Therafter, the distance between the trains decreases at a rate (60 - 40) = 20 mph. The gap disappears after 8/20 h = 24 minutes.

24 minutes after 5:37 is 6:01 AM

You can also do this with equations, but my way is quicker.

- Algebra -
**Damon**, Saturday, January 30, 2010 at 3:33pmA travels 12 minutes or 12/60 = 1/5 hour longer that B

If A travels t hours, B travels (t-1/5) hours

They go the same distance (rate*time)

so

40 t = 60(t-1/5)

get t

change it to minutes by multiplying by 60

add it to when A passed the station.

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