Pipe A can fill a tank in 3 hours. Due to a leak at the bottom, it takes 9 hours for the pipe A to fill the tank. In what time can the leak alone empty the full tank?	Choose the correct choice from the following answers:	A) 4.5	B) 17	C) 18	D) 19	E) 12
Let the leak can empty the full tank in x hours 1/3 - 1/x = 1/9   =&gt; 1/x = 1/3 - 1/9 = (3 - 1)/9 = 2/9   =&gt; x = 9/2 = 4.5.   4.5nswer: 4.5
<result>A</result>
Pipe A can fill a tank in 3 hours. Due to a leak at the bottom, it takes 9 hours for the pipe A to fill the tank. In what time can the leak alone empty the full tank?