Question

The efficiency of inlet pipe 'P' is 60% of the efficiency of another inlet pipe 'Q'. When both pipes are opened together, they fill a tank in 4 hours. How long will it take for pipe 'Q', operating at 80% of its efficiency, to fill a tank that is 50% larger in capacity than the original tank?

A 9.6 hrs
B 12 hrs
C 15 hrs
D 8.4 hrs
E 7.2 hrs
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