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Since you stated the first train as travelling at 30 mph lets assume the train travelling at 30 mph starts on the left end of the track travelling to the right, and the second train starts on the right end of the track travelling to the left. In this case the two trains will meet 3/7 of the way from the left of the track.

To illustrate what i mean in case that doesn't make sense, imagine a number line going from 0 to 70 with the train travelling at 30 mph starting from 0, and the train travelling at 40 mph starting from 70. The two trains will meet on the number line where 30 is as it's 3/7 along the line from 0.

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15y ago

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