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?
Pick one.
A) 5 hrs
B) 6 hrs
C) 8 hrs
D) 7.5 hrs
E) 4 hrs
Time taken by one tap to fill the tank = 4 hrs.   Part filled by the taps in 1 hour = 4 * 1/8 = 1/2   Remaining part = 1 - 1/2 = 1/2   1/2 : 1/2 :: 1 : x   x = 1/2 * 1 * 2= 
<gadget id="calculator">1/2 * 1 * 2</gadget>
<output>1</output>
1 hrs. i.e., 60 min   So, total time taken= 3 hrs 60 min = 4 hrs   ANSW4 hrsR: 4 hrs
<result>E</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?