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Pipe ‘X’ and pipe ‘Y’ together can fill an empty tank in 24 hours while pipe ‘Y’ and pipe ‘Z’ together take 15 hours to fill the same tank. If the efficiency of pipe ‘Z’ is twice that of pipe ‘X’, then find the time taken by pipe ‘Y’ to fill the tank alone.

A 60 hrs

B 35 hrs

C 75 hrs

D 45 hrs

E None of these

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