Two cars X and Y start from two places A and B respectively which are 700 km apart at 9 a.m. Both the cars run at an average speed of 60 km/hr. Car X stops at 10 a.m. and again starts at 11 a.m. while the other car Y continues to run without stopping. When do the two cars cross each other?

1. (a)2:40 p.m.
2. (b)3:20 p.m.
3. (c)4:10 p.m.
4. (d)4:20 p.m.