Homework Help: math

Posted by Beth on Thursday, February 7, 2013 at 11:29pm.

a freight train is traveling 30mph. An automobile starts out from the same place 1 hour later and overtakes the train in 3 hours. What was the rate of the automobile?

math - Steve, Thursday, February 7, 2013 at 11:44pm
in one hour the train moved 30 miles ahead.

The car made that up in 3 hours, so its speed was 10 mph greater than the train's.

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