Pipe A can fill a tank in 15 minutes and pipe B cam empty it in 24 minutes. If both the pipes are opened together after how many minutes should pipe B be closed, so that the tank is filled in 30 minutes? Choose the correct choice from the following answers
A) 18	B) 27	C) 98	D) 27	E) 24
Let the pipe B be closed after x minutes.   30/15 - x/24 = 1 =&gt; x/24 = 30/15 - 1= 
<gadget id="calculator">30/15 - 1</gadget>
<output>1</output>
1=&gt; x = 1* 24= 
<gadget id="calculator">1* 24</gadget>
<output>24</output>
24.   Answer:24
<result>E</result>
Pipe A can fill a tank in 15 minutes and pipe B cam empty it in 24 minutes. If both the pipes are opened together after how many minutes should pipe B be closed, so that the tank is filled in 30 minutes?