Pipe A can fill a tank in 3 hours. Due to a leak at the bottom, it takes 6 hours for the pipe A to fill the tank. In what time can the leak alone empty the full tank? Select the correct option:
A) 67	B) 88	C) 4.5	D) 26	E) 12
Let the leak can empty the full tank in x hours 1/3 - 1/x = 1/6   =&gt; 1/x = 1/2 - 1/6 = 1/4.5   =&gt; x = 4.5 Answer:4.5
<result>C</result>
Pipe A can fill a tank in 3 hours. Due to a leak at the bottom, it takes 6 hours for the pipe A to fill the tank. In what time can the leak alone empty the full tank?