Tap A can fill a tank in 6 minutes. After filling half of the tank 3 more similar taps opened in the tank. In what time the tank filled completely?
Answer & explanation
Correct answer: option 2
A can fill the tank in - 6min
let capacity of the tank is 6 ltr
therefore, Efficiency of A = 1 ltr/min
Half tank i.e. 3 ltr will be filled in 3 min
Then, three more pipes are open with the efficiency of 1 ltr/min
Now,
Remaining tank = 3 ltr
Efficiency working = 1 + 1 + 1 + 1 = 4 ltr/min
Time =\(\frac{3}{4}\) min = 45 sec
Total time = 3 min 45 sec.