A, B, C start at the same time in the same direction to run around a rectangular garden. A completes a round in 252 seconds, B in 308 seconds and C in 198 seconds starting at the same point. After what time will they meet again at the starting point?
1
20 minutes 18 seconds
2
40 minutes 20 seconds
3
46 minutes 12 seconds
4
30 minutes