What you cannot hold but it is yours?

A large water tank has two inlet pipes (a large one and a small one) and one outlet pipe. It takes 3 hours to fill the tank with the large inlet pipe. On the other hand, it takes 6 hours to fill the tank with the small inlet pipe. The outlet pipe allows the full tank to be emptied in 9 hours.

What fraction of the tank (initially empty) will be filled in 0.64 hours if all three pipes are in operation? Give your answer to two decimal places (e.g., 0.25, 0.5, or 0.75).

What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle:

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

Its something that each of us devours,
Not just us but birds, beats, trees, and flowers,
Frets iron and nibbles steel,
Toil hard stones to meal,
Exterminates king, collapse town,
And blows the mountains down.

Why is it against the law for a man living in Delhi to be buried in Mumbai?

Solve the following series:
AZ, GT, MN, __, YB

Which is heavier: a ton of bricks or a ton of feathers?

Can you count the number of blocks in the picture below?