Two trains - Math Central

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If the 1st train goes 60 mph and the 2nd train leaves 10 minutes later at a speed of 70 mph, how long does it take to catch up with the 1st train.

Hi,

The first train travels at 60 mph so how far has it gone in 10 minutes which is $\frac{10}{60}$ of an hour? The second train is traveling at 10 mph faster than the first. How long will it take for the second train to catch up to the first?

Penny

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