A train leaves from point A for point B at 80 mph. After half an hour, another train leaves from point B for point A at 60 mph.

Which of the trains will be farther from point A when they meet ?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

What demands an answer, but asks no questions

If 21x = 79x, what is the value of x?

What has a ring but no finger?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not rounded numerals equals 24.

What does this below rebus puzzle mean?

Can you find the dog hidden in a group of pandas?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?