A tap can fill a tank in 8 hours. After half the tank is filled, two more similar taps are opened. What is the total time taken to fill the tank completely?	Select the correct option.
A) 1 hr 20 min B) 4 hr C) 3 hr D) 5 hr 20 min E) 2 hr 50 min
Explanation:   1 tap can fill the tank in 8 hours.   Therefore   1 tap can fill half tank in 4 hours.   3 taps can fill the tank in 8/3 hour.   Therefore   3 taps can fill half tank in 8/6 hour =1hour 20 minutes.   Total time taken=5 hour 20 minutes   Answer: Option 5 hr 20 min
<result>D</result>
A tap can fill a tank in 8 hours. After half the tank is filled, two more similar taps are opened. What is the total time taken to fill the tank completely?