A tap can fill a tank in 8 hours. After half the tank is filled, three more similar taps are opened. What is the total time taken to fill the tank completely?	Select.
A) 5 hr
B) 1 hr 30 min
C) 2 hr 30 min
D) 2 hr
E) 4 hr
Explanation:   A tap can fill a tank in 8 hours.   Therefore the tap can fill half the tank in 4 hours.   Remaining part =1/2   One tap take time to fill half of the tank = 4 hrs   4 taps take time to fill half of the tank = 4/4= 
<gadget id="calculator">4/4</gadget>
<output>1</output>
1 hr   Total time taken to fill the tank= 4+1= 
<gadget id="calculator">4+1</gadget>
<output>5</output>
5 hrs   5 hrnswer : 5 hr
<result>A</result>
A tap can fill a tank in 8 hours. After half the tank is filled, three more similar taps are opened. What is the total time taken to fill the tank completely?