Question

Pipes 'G' and 'H' can fill a tank in 24 hours and 8 hours respectively, while pipe 'I' can empty it in 48 hours. All pipes are opened together when the tank was empty. After 3 hours, pipe 'G' is closed. Find the total time taken to fill the tank.

A 12.5 hrs
B 8.4 hrs
C 18.9 hrs
D 20 hrs
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