Question
Time taken by pipes 'X', 'Y' and 'Z' to fill a tank is 48 minutes, 80 minutes and 60 minutes respectively. All the pipes are opened together. 'X' is closed after 't' minutes, and 'Y' is closed (2t - 1) minutes before the tank is filled. If the tank is filled in 35 minutes, then determine the value of 't'.
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