Pipe A can fill a tank in 6 hours. Due to a leak at the bottom, it takes 8 hours for the pipe A to fill the tank. In what time can the leak alone empty the full tank?  Pick: A) 13 B) 24 C) 18 D) 19 E) 12
Let the leak can empty the full tank in x hours 1/6 - 1/x = 1/8   =&gt; 1/x = 1/6 - 1/8 = (4 - 3)/24 = 1/24   =&gt; x = 24.   Answer: 24
<result>B</result>
Pipe A can fill a tank in 6 hours. Due to a leak at the bottom, it takes 8 hours for the pipe A to fill the tank. In what time can the leak alone empty the full tank?