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Question

Pipe ‘X’ and pipe ‘Y’ can fill a tank in 30 hours and 45 hours respectively. Pipe ‘Z’ is 20% more efficient than pipe ‘X’. If pipe ‘Y’ and pipe ‘Z’ are turned on together for 10 hours, how long will pipe ‘X’ take to fill the rest of the tank alone?

A 18.44 hrs

B 11.33 hrs

C 17.77 hrs

D 11.11 hrs

E None of these

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