What is the total time taken to fill the tank completely?
Answer: (1) 3 hrs. 45 min.
A tap can fill a tank = 6 hours
Therefore, a tap can fill half the tank = 6/2 = 3 hours
Three more similar taps are opened,
Then, time taken by four taps = 3 x 60/4
= 45 min
Then, the total time taken to fill the tank complete = 3 hrs. 45 min.
Hence, correct answer is option (1) 3 hrs. 45 min.