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**Type : **Subjective

Two pipes A and B can fill a tank in 24 hours and 120/7hours respectively. Harihar opened the pipes A and B to fill an empty tank and some times later he closed the taps A and B, when the tank was supposed to be full. After that it was found that the tank was emptied in 2.5 hours because an outlet pipe ‘C’ connected to the tank was open from the beginning. If Harihar closed the pipe C instead of closing pipes A and B the remaining tank would have been filled in (hours)

*Type in your answer as an integer. For example, if your answer is 17, type 17*