Two inlet pipes A and B and an outlet pipe C together can fill a tank in 15 minutes and pipes A and C together can fill that tank completely in 30 minutes. If time taken by pipes B and C together to fill that tank is 1 hour, then what is the time taken by pipes A and B together to fill that tank?
1
12 minutes
2
(20/3) minutes
3
(40/9) minutes
4
8 minutes