A tap can fill a tank in 6 hours. After half the tank is filled, three more similar taps are opened. What is the total time taken to fill the tank completely?
Choose the correct option:
A) 3 hrs 45 min B) 4 hrs C) 2 hrs D) 3 hrs 15 min E) 2 hrs 45 min
time taken by one tap to fill half = 3 hrs   part filled by four taps in 1 hr (4*1/6)=2/3   remain =(1-1/2)=1/2   =&gt;2/3:1/2=&gt;1:x   tot time = 3 hrs 45 min   3 hrs 45 minNSWER 3 hrs 45 min
<result>A</result>
A tap can fill a tank in 6 hours. After half the tank is filled, three more similar taps are opened. What is the total time taken to fill the tank completely?