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Difficulty: MediumPuzzle 401

The map below shows the street locations of a city. Position three police officers such that the entire length of every street can be seen by at least one officer.

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[Ref: ZMUA] © Cihan Altay

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Difficulty: MediumPuzzle 402

Can you determine which number best completes this puzzle?

?

[Ref: ZDNQ] © Kevin Stone

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Difficulty: MediumPuzzle 403

Puzzle IconAfter visiting my Great Aunt Anne, I travelled home in her old jalopy. The car was old and battered, it had a leak from the petrol tank, and I was stuck in second gear.

This meant that I could only travel along at a steady 30 miles per hour and managed a paltry 20 miles per gallon of fuel.

At the start of the journey I had placed exactly 10 gallons of fuel into the tank. I knew though, that the fuel tank lost fuel at the rate of half a gallon per hour.

Just as I arrived home, the car stopped because it had run out of fuel and I had only just made it.

How far was it from my Great Aunt's to my home?

[Ref: ZQDR] © Kevin Stone

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Difficulty: MediumPuzzle 404

A rope swing hangs vertically down so that the end is 12 inches from the ground, and 48 inches from the tree.

If the swing is pulled across so that it touches the tree, it is 20 inches from the ground.

How long is the rope?

Puzzle Image

[Ref: ZYJB] © Elliott Line
This puzzle appeared in Mensa's EnigmaSig (198.24) and is used with permission.

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