Two pipes A and B can fill a tank in 8 hours and 16 hours respectively. If both pipes are opened simultaneously, how much time will be taken to fill the tank?
Choose the correct choice from the following:
A) 5 hours 20 min
B) 5 hours 49 min
C) 3 hours 50 min
D) 3 hours 22 min
E) 3 hours 42 min
Explanation:   Part filled by 5 hours 20 min in 1 hour = 1/8   Part filled by B in 1 hour = 1/16   Part filled by (5 hours 20 min + B) in 1 hour = ( 1/8 + 1/16) = (3/16)   Time taken to fill the tank is (16/3) = 16/3*60= 
<gadget id="calculator">16/3*60</gadget>
<output>320</output>
320 mins= 5 hrs 20 mins   5 hours 20 minNSWER 5 hours 20 min
<result>A</result>
Two pipes A and B can fill a tank in 8 hours and 16 hours respectively. If both pipes are opened simultaneously, how much time will be taken to fill the tank?