Two trains start 300 miles apart traveling toward each other at 60 and 90 mph. How long until they meet?

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Two trains start 300 miles apart and travel toward each other, one at 60 mph and the other at 90 mph. How long will it take for them to meet?

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Answer

2 hours. Their combined closing speed is 150 mph, and 300 miles divided by 150 mph equals exactly 2 hours.

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