Two stations A and B are 80 km apart on a straight line. One train starts from Station A at 7 a.m. and travels towards B at 20 kmph. Another train starts from Station B at 8 a.m. and travels towards A at a speed of 40 kmph. At what time will the two trains meet?
1
9.05 a.m.
2
9.20 a.m.
3
8.30 a.m.
4
9.00 a.m.