Stations A and B are 240 km apart. At the same moment one train leaves A at 60 km/h and another leaves B at 40 km/h, towards each other. Each halts 30 minutes at the far end and returns at the same speed. How long after the start do they meet for the second time?

Question

Accepted Answer

7 h 42 min. The fast train reaches B at 4 h, leaves at 4.5 h. The slow train reaches A at 6 h, leaves at 6.5 h; by then the fast train is 120 km from A. Gap 120 km closes at 100 km/h in 1.2 h → 6.5+1.2=7.7 h = 7 h 42 min.

Stations A and B are 240 km apart. At the same moment one train leaves A at 60 km/h and another leaves B at 40 km/h, towards each other. Each halts 30 minutes at the far end and returns at the same speed. How long after the start do they meet for the second time?

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