The fugitive is at the origin. He moves at a speed of 100. You have a guard at every integer coordinate except the origin. A guard's speed is 1. The fugitive and your guards move simultaneously and continuously. If he's within 1/100 distance from a guard, the fugitive is caught and you win the ga...

A man sent his son to a neighbor's house during mealtime. He instructed him to take note of how many people were present during the meal, and to report his findings to him as quickly as possible. The son returned with the news that there are five people present. The man sent a younger son on the ...

During her youth, a woman has three disadvantages, but when she grows old with age, only two of them remain. What are they?

Find 4 consecutive numbers that divide into 2,3,5,7,respectively or prove it's impossible. No computers, except for checking. If there are multiple solutions, list them all or make a formula for generating them.

Find 4 consecutive numbers that divide 𝑤, 𝑥, 𝑦, 𝑧 respectively, where 𝑤, 𝑥, 𝑦, and 𝑧 are also 4 consecutive numbers, or prove it's impossible.

This is a variation on the classic Slitherlink Puzzle. However, instead of creating one loop, you must create 2 separate loops. The two loops can not share any edges, however they can cross or meet on vertices. The two loops each have their own clues. As is standard, the clue describes the numbe...