Two pipes A&B can fill a tank in 24 min and 32 min respectively. If both the pipes are opened simultaneously, after how much time B should be closed so that the tank is full in 18 min.
Pick one
A) 8 min B) 3 min C) 21 min D) 23 min E) 24 min
3/4 tank is filled by A in 18 mins.   then balance 1/4 tank is filled by B in 32*1/4= 
<gadget id="calculator">32*1/4</gadget>
<output>8</output>
8 mins.   8 minNSWER:8 min
<result>A</result>
Two pipes A&B can fill a tank in 24 min and 32 min respectively. If both the pipes are opened simultaneously, after how much time B should be closed so that the tank is full in 18 min.