There is a circular path around a sports field. Shanu takes 15 minutes to drive one round of the field. While Ranu takes 20 minutes for the same. They both start at the same point and at 7:30 am in same direction. At what time will they meet again at the starting point?
1
8:30 am
2
9:30 am
3
10:30 am
4
11:30 am