A, B and C are three pipes connected to a tank. These pipes can till the tank separately in 10 hour, 15 hour and 20 hour respectively When all the three pipes are opened simultaneously. it was observed that pipes A and B were supplying water at 4/5 of their normal rates for the first 2 hour, after which they supplied water at normal rate. Pipe C supplied water at 3/4 of its normal rate for first 3 hour after which it supplied at its normal rate. In how much time in hours, tank would be filled?

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