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?

A man was just doing his job when his suit was torn. Why did he die three minutes later?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

What does below Rebus say?

XLR8

What is the next number in the series?

15 29 56 108 208 ?

What occurs twice in a week, once in a year but never in a day?

If an earthquake is 1 point higher on the Richter Scale than another earthquake which is actually 10 times stronger, how much stronger would an earthquake be if it was just half a point higher on the Richter scale?

Can you find out the remainder when 3^300 is divided by 5?

'S' refers to the number of seconds in a day and 'H' refers to the number of hours in ten years. Which quantity out of these two is greater?

Why is a river so rich ?