How many sides does a circle have?

If you had an infinite supply of water and 5-quart and 3-quart pails, how would you measure exactly 4 quarts? What is the least number of steps you need?

How do you go from 98 to 720 using just one letter?

There are three houses in a straight row. One is red, one is blue, and one is white. The red house is left of the middle. The blue house is right of the middle. Where's the white house?

What do you see in the image below

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?

There is something which is always coming but never arrives?

Can you place three balls such that the equation shown in the picture holds true?

What is the word or phrase?

I know a nine-letter word having only one vowel.
Do you ?