If the time taken by pipe A is 9 hours more than time taken by A + B together and pipe B takes 36 hours more than the time taken by A + B together, then find the time taken by pipe B to fill the tank.
Answer & explanation
Correct answer: option 2
Time taken by A+B = \(\sqrt {9 × 36}\)
= \(\sqrt {324}\) = 18
Time taken by B = 18 + 36 = 54 hours