Two stations are 120 km apart on a straight line. A train starts from station A at 8 a.m. and moves towards station B at 20 km/h, and another train starts from station B at 9 a.m. and travels towards station A at a speed of 30 km/h. At what time will they meet?
1
10:30 a.m.
2
10:00 a.m.
3
11:00 a.m.
4
11:30 a.m.