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ATQ,
Taps P and Q fill the tank in the first minute:
After 1 minute, Taps P, Q, and R work together:
Remaining work = 1 - 7/60 = 53/60
Time to complete remaining work =(53/60)/(1/12) = 10.6 minutes Total time = 1minute + 10.6minutes = 11 minutes 36 seconds.
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