Why did the Girl throw the butter out of the window?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

What's the best place to go shopping in the ocean?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

During which month do people sleep the least?

Three cars are driving on a track that forms a perfect circle and is wide enough that multiple cars can pass anytime. The car that is leading in the race right now is driving at 55 MPH and the car that is trailing at the last is going at 45 MPH. The car that is in the middle is somewhere between these two speeds.
Right now, you can assume that there is a distance of x miles between the leading car and the middle car and x miles between the middle car and the last car and also, x is not equal to 0 or 1.
The cars maintain their speed till the leading car catches up with the last car and then every car stops. In this scenario, do you think of any point when the distance between any two pairs will again be x miles i.e. the pairs will be x distance apart at the same time ?

What does the below rebus riddle means?

How can you write nineteen in a manner that if we take out one, it becomes twenty?