A inlet pipe can fill a tank in 12 hours and an outlet pipe can empty the tank in 16 hours. If both the pipes are opened simultaneously, find the time taken to fill the tank.	Choose the correct choice from the following answers.
A) 36 hours B) 12 hours C) 4 hours D) 48 hours E) 58 hours
Explanation:   As the inlet can fill the tank in 12 hours, in one hour it will fill 1/12th of the tank.   Similarly, the outlet pipe in one hour can empty 1/16th part of the tank.   If both are opened simultaneously, the part of the tank filled in one hour is:   1/12 - 1/16 = 1/48   Hence, the tank gets filled in 48 hours.   ANSWER 48 hours
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A inlet pipe can fill a tank in 12 hours and an outlet pipe can empty the tank in 16 hours. If both the pipes are opened simultaneously, find the time taken to fill the tank.