Two pipes A and B can fill a tank in 2 and 6 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank? Choose the correct choice from the following answers.
A) 2.5 min	B) 1.8 min	C) 1.5 min	D) 3.5 min	E) 2 min
Part filled by the first pipe in 1 minute = 1/2   Part filled by the second pipe in 1 minute = 1/6   Net part filled by pipe A and pipe B in 1 minute = (1/2)+(1/6)=2/3   i.e, pipe A and B together can fill the tank in   3/2= 
<gadget id="calculator">  3/2</gadget>
<output>3/2 = around 1.5</output>
1.5 minutes   Answer is 1.5 min
<result>C</result>
Two pipes A and B can fill a tank in 2 and 6 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank?