Tap A can fill a tank in 6 hours and tap B can empty the same tank in 10 hours. If both taps are opened together, then how much time (in hours) will be taken to fill the tank?
Answer & explanation
Correct answer: option 1
A+ = 6 hrs, B- = 10 hrs,
⇒ Time required by A + B to completely fill the tank = \(\frac{30}{5-3}\) = \(\frac{30}{2}\) = 15 hrs.