Description for Correct answer:
We know that, when a pipe fills a tank in m h, then the part of tank filled in 1 h

Here, m = 5 Required part of the tank to be filled in 1 h = \( \Large \frac{1}{m} \)

Here, m = 6

Therefore, Required part of the tank to be filled in 1 h = \( \Large \frac{1}{6}\ part \)