Question

Pipe ‘X’ and pipe ‘Y’ can fill a tank alone in 36 hours and 18 hours, respectively. If both pipes are opened together and pipe ‘Y’ is closed after 6 hours, then find the time taken by pipe ‘X’ to fill the remaining portion of the tank alone.

A 18 hours
B 24 hours
C 15 hours
D 12 hours
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