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A Water Tank Can Be Filled in 12 Hours by an Inlet

Question 39

Multiple Choice

A water tank can be filled in 12 hours by an inlet pipe and emptied in 30 hours by an outlet pipe. How long will it take to fill the tank if both pipes are left open?


A) 60 hours
B) 21 hours
C) 30 hours
D) 42 hours
E) 20 hours

Correct Answer:

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