Question

Pipe ‘X’ can fill a cistern in 15 hours while pipe ‘Y’ can drain the cistern in 25 hours. Both pipes are opened at the same time, but pipe ‘Y’ is shut off after 5 hours. How long will pipe ‘X’ take to fill the rest of the cistern?

A 11 hrs
B 17 hrs
C 10 hrs
D 13 hrs
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