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.?
Choose the correct choice from the following answers:	A) 8 min	B) 9 min	C) 7 min	D) 6 min	E) 5 min
work done by 8 min =&gt; 18/24   work done by B =&gt; x/32   18/24 + x/32 = 1   3/4 + x/32=1   24+x=32 =&gt; x=8   8 minNSWER:8 min
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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.?