Question

Pipes ‘A’ and ‘B’ can fill a tank in 15 hours and 30 hours, respectively. Pipe ‘A’ was opened 3 hours before pipe ‘B’ and then operated with pipe ‘B’ for 6 hours after which pipe ‘B’ was closed. Find the total time taken to fill the tank this way.

A 10 hours
B 11 hours
C 12 hours
D 14 hours
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