A tap can fill a tank in 12 hours. After half the tank is filled, two more similar taps are opened. What is the total time taken to fill the tank completely? Choose the correct answer:  A) 1 hr 20 min  B) 4 hr  C) 6 hr  D) 8 hr 00 min  E) 2 hr 50 min
Explanation:   1 tap can fill the tank in 12 hours.   Therefore   1 tap can fill half tank in 6 hours.   3 taps can fill the tank in 12/3= 
<gadget id="calculator">12/3</gadget>
<output>4</output>
4 hours.   Therefore   3 taps can fill half tank in  4/2= 
<gadget id="calculator"> 4/2</gadget>
<output>2</output>
2 hours.   Total time taken=8 hour 00 minutes   Answer: Option 8 hr 00 min
<result>D</result>
A tap can fill a tank in 12 hours. After half the tank is filled, two more similar taps are opened. What is the total time taken to fill the tank completely?