Two cars X and Y start from 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 at stops 10 a.m. and again starts at 11 a.m. while the other car continues to run without stopping. The two cars cross each other at `2: 40\ pdotmdot` b. `3: 20\ pdotmdot` c. `4: 10\ pdotmdot` d. `4: 20\ pdotmdot`