What begins with T, ends with T, and has T in it?

How many letters are in the alphabet?

What number should come in place of the question mark below?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Can you identify the hidden rebus in the image below?

What is the word or phrase below?
R | E | A | D

A swan sits at the center of a perfectly circular lake. At an edge of the lake stands a ravenous monster waiting to devour the swan. The monster can not enter the water, but it will run around the circumference of the lake to try to catch the swan as soon as it reaches the shore. The monster moves at 4 times the speed of the swan, and it will always move in the direction along the shore that brings it closer to the swan the quickest. Both the swan and the the monster can change directions in an instant.
The swan knows that if it can reach the lake's shore without the monster right on top of it, it can instantly escape into the surrounding forest.

How can the swan successfully escape?

There are two insects on a tile. Insect X is sitting on one side of the tile (point A) and Insect Y is sitting opposite on the other side of the tile (point B). Now both of them decide to change their position and thus X starts crawling to point B and Y starts crawling to point A. When they meet and pass each other in between, X takes 20 seconds to reach B and Y takes just 5 seconds to reach A.

Can you calculate the total time each of the insects took to change their positions?

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

Which tank will fill first?