A tank is normally filled in 18 hours but due to a leak in the bottom, it takes 3 hours more to fill completely. If the tank is filled completely, in what time will the leak empty it completely ?

 A tank is normally filled in 18 hours but due to a leak in the bottom, it takes 3 hours more to fill completely. If the tank is filled completely, in what time will the leak empty it completely ?

A). 120 hours

B). 122 hours

C). 124 hours

D). 126 hours

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