They were all girl teams.

The answer is "E N T". As this sequence represents the first letter of number one to ten.

There are a few ways of solving this one. I like the following simple way of thinking.
The given situation (when the hour and minute hands overlay) occurs in 12 hours
exactly 11 times after the same time. So it’s easy to figure out that 1/11 of the clock
circle is at the time 1:05:27,273 and so the seconds hand is right on 27,273 seconds.
There is no problem proving that the angle between the hours hand and the seconds
hand is 131 degrees.

Cornfield.

yesterday, today, and tomorrow.

The V.

21
(1+1=2/2+1=3/3+2=5...)

If they're square it's possible for the cover to slip down the hole (diagonally). A round manhole cannot fall down no matter which way it is rotated because it's width in any direction is greater than the opening on the hole.

There is an easy equation which can help:
1 brick = 1 kg + 1/2 brick
And so 1 brick is 2 kg heavy.

The letter “n”.

Mercury.

An echo