An inlet tap can fill a tank in 20 hours. This tap was opened at time zero, but after 4 hours (t = 4), a leak developed at the bottom. After 8 hours (t = 8), the cross section of the leak became triple because of which, it took 30 hours to fill the tank. How much time will it take to fill the tank if the cross section of the hole does not change at t = 8?
[Type in your answer as the nearest possible integer in seconds.]
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