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Posted by **LIbby** on Monday, April 2, 2012 at 11:10pm.

averages 60 miles per hour and the other averages 80 miles per hour. After how long will they

be 420 miles apart?

- Algebra -
**Reiny**, Monday, April 2, 2012 at 11:43pmThey each travel for t hours

distance covered by first train = 60 t miles

distance covered by 2nd train = 80t miles

60t+80t = 420

140t = 420

t = 3

3 hours.

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