Two taps A and B can fill an overhead tank in 15 hours and 18 hours respectively. Both the taps are opened for 7 hours and then B is turned off. How much time will A take to fill the remaining tank?
1
\(\frac{{12}}{7}\) hours
2
\(\frac{{32}}{7}\) hours
3
\(\frac{{13}}{6}\) hours
4
\(\frac{{37}}{4}\) hours