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).

f you were running a race, and you passed the person in 2nd place, what place would you be in now?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

A horse was tied to a rope 5 meters long and the horses food was 15 meters away from the horse. How did the horse reach the food?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

What is so fragile that saying its name breaks it?

I have eight fingers and two thumbs but I do not live. What Am I?

Which English verb becomes past tense just by rearranging the letters?

It is always ahead of me yet I can never see it. What is it?

What goes up but never comes down?