Question 903596
1/x+1/y=1/p
1/3+1/6=1/p
2/6+1/6=1/p
3/6=1/p
1/2=1/p
p=2 days with just the inlets open

1/3+1/6-1/4=1/p
4/12+2/12-3/12=1/p

3/12=1/p
1/4=1/p
p=4 days  with the inlets and the pump open