Sunder, Ramu, and Chhotu can dig a well in 9, 18 and 36 days respectively. They all started digging together. Sunder worked continuously till well dug completely, Ramu leaves the work 3 days before its completion and Chhotu leaves the work 2 days before its completion. What is the time taken to dig the well?
1
45/7 days
2
7 days
3
55/7 days
4
44/7 days
5
6 days