Two pipes A and B can fill a tank in 12 and 24 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank?	Choose the correct option:
A) 6 minutes  B) 8 minutes  C) 5 minutes  D) 2 minutes  E) 7 minuteS
Required time =12*24/12+12=12*24/36   =24/3= 
<gadget id="calculator">24/3</gadget>
<output>8</output>
8 minutes   ANSWER:8 minutes
<result>B</result>
Two pipes A and B can fill a tank in 12 and 24 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank?