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POW: 07-09-2018

Riddle:

Walking home one day, you take a short cut along the train tracks. The tracks cross a narrow bridge over a deep gorge. At the point you are 3/8 of the way across the bridge, you hear the train whistle somewhere behind you. You charge across the bridge, and jump off the track as the train is about to run you down. As it happens, if you had gone the other way, you would have reached safety just before being run over as well. If you can run ten miles per hour, how fast is the train moving?

Answer:

The train is moving at 40 miles per hour. Imagine that a friend is walking with you. When the train whistle blows, you head away from the train, he heads toward it. When he reaches safety, you will be 6/8 (or 3/4)of the way across the bridge, and the train will have just reached the bridge. For the train to cross 4/4 of the bridge in the time you cross the remaining 1/4, the train must be moving four times your speed.

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POW: 07-02-2018

Riddle:

Lazy Larry agreed to work on a job for his brother-in-law for thirty hours at eight dollars an hour, on the condition that he would forfeit ten dollars per hour for every hour that he idled. At the end of the thirty hours Larry wasn't owed any money and didn't owe his brother-in-law any money either. How many hours did Larry work and how many hours did he idle?

Answer:

Lazy Larry worked 16-2/3 hours and idled 13-1/3 hours. 16-2/3 hours, at $8.00 an hour amounts to the same amount as 13-1/3 hours at $10.00 per hour.

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POW: 06-25-2018

Riddle:

What can go up and come down without moving?

Answer:

The temperature.

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Riddle:

Lighter than what I am made of, More of me is hidden than is seen. What am I?

Answer:

An iceberg.

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POW: 06-11-2018

Riddle:

A boy has as many sisters as brothers, but each sister has only half as many sisters as brothers.


How many brothers and sisters are there in the family?

Answer:

Four brothers and three sisters.

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To see more past Problem of the Week's refer to the Riddles Newsletter annals.

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