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Pipes P, Q, and R can fill a tank in 15 hours, 10 hours, and 30 hours respectively. If the efficiencies of pipes P and Q are each reduced by 40% of their original efficiency and all three are opened together, find the total time taken by them to fill the tank.

A 10 hrs

B 5.4 hrs

C 12 hrs

D 7.5 hrs

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