A tap can fill a tank in 14 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
A) 11 hrs 45 mins B) 12 hrs 45 mins C) 13 hrs 45 mins D) 14 hrs 45 mins E) 15 hrs 45 mins
Time taken by one tap to fill the tank = 7 hrs.   Part filled by the taps in 1 hour = 4 * 1/14 = 2/7   Remaining part = 1 - 1/2 = 1/2   2/7 : 1/2 :: 1 : x   x = 1/2 * 1 * 7/2 = 7/4 = 105 mins = 1 hr 45 mins   So, total time taken = 15 hrs 45 mins   ANSW15 hrs 45 minsR: 15 hrs 45 mins
<result>E</result>
A tap can fill a tank in 14 hours. After half the tank is filled three more similar taps are opened. What is the total time taken to fill the tank completely?