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# What was their average speed?

Two youngsters were running as hard as they could. They averaged 6 miles per hour, and then had to rest. On the way back, they averaged only 4 miles per hour for the same distance. Not counting resting time, what was their average speed?

The correct answer is 4.8, not 5, miles per hour. The answer is obtained by dividing the distance covered by the time elapsed, and any distance will do. Take a 12-mile run, for instance. That will take them two hours out and three hours back. It, therefore, took them five hours to travel 24 miles.

## How can this be?

A certain large animal lives happily and thrives here on Earth. One day, every single one of these critters is wiped out by a mysterious disease which affects only this particular animal. There are none left anywhere on earth -- they are all gone. About a year or so...

## How old is Mike?

David and Mike are brothers. David is 33 years old today. This is three times as old as Mike was when David was the age that Mike is today.How old is Mike?Mike is 22 years old.more riddlesDonec rutrum congue leo eget...