There are two water taps in a tank which can fill the empty tank in 12 hours and 18 hours respectively. It is seen that there is a leakage point at the bottom of the tank which can empty the completely filled tank in 36 hours. If both the water taps are openedat the same timetofill the empty tank and the leakage point was repaired after 1 hour, then in how muchtime the empty tank will be completely filled?