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Pipes A, B, and C can fill a tank in 10 hours, 5 hours, and 20 hours respectively. If the efficiencies of pipes A and B are each reduced by 50% of their original efficiency and all three pipes are opened together, find the total time taken by them to fill the tank.

A 10 hrs

B 5 hrs

C 12 hrs

D 18 hrs

E None of these

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