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?
A
4 hrs 15 min
B
3 hrs 45 min
C
3 hrs 24 min
D
4 hrs 51 min
Correct Answer: 3 hrs 45 min
1 tap full = 6 hrs 1 tap half = 3 hrs 4 tap halp = 34hrs = 45 min.'. Total = 3 hrs 45 min