Question

Pipe ‘A’ and pipe ‘B’ can fill a tank alone in 45 hours and 15 hours, respectively. If both pipes are opened together and pipe ‘B’ is closed after 6 hours, then find the time taken by pipe ‘A’ to fill the remaining portion of the tank alone.

A 18 hours
B 30 hours
C 24 hours
D 21 hours
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