The fast and slow trains start from both places at the same time and run in opposite directions. They meet at 4km from the midpoint. The speed of the slow train is 6 / 7 of that of the fast train. How about the distance between the two places?

When we met, the express train went 8 kilometers more than the local train
The distance of slow train is 6 / 7 of that of express train
So the fast train went 56 kilometers and the slow train 48 kilometers
So the distance between the two places is 56 + 48 = 104 km

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