daphne9858 daphne9858

23-01-2024
Physics

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Three pipes P, Q, and R can fill a tank in 12, 15, and 20 minutes, respectively. If pipe P is opened all the time and pipes Q and R are opened for one hour alternatively, the tank will be full in:
A) 5 hours
B) 6 hours
C) 7 hours
D) 8 hours

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