Tap A can fill a tank in 20 hours and tap B can fill the same tank in 30 hours. If both taps are opened together, then how muchtime will be taken to fill the tank?
Answer & explanation
Correct answer: option 3
A+ = 20 hrs, B+ = 30 hrs,
⇒ Time required for A + B to fill the tank completely = \(\frac{60}{3+2}\) = \(\frac{60}{5}\) = 12 hrs.