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Difficulty: MediumPuzzle 281

Can you complete these 5-letter words?

.S.G.
..R.F
.ZU..
E..X.
.P..C
..LN.
.W..M
...JO
Q...A
.V.K.
I..H.
.B.Y.
..DT.

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[Ref: ZCIV] © Kevin Stone 


Difficulty: MediumPuzzle 282

I have a machine which has four sequential cog wheels in constant mesh.

The largest cog has 21 teeth and the others have 17, 12 and 10 respectively.

What is the fewest number of revolutions the largest cog must make so that all of the cogs are back in their starting position?

Cogs

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[Ref: ZOUQ] © Kevin Stone 


Difficulty: MediumPuzzle 283

Puzzle IconYou have the misfortune to own an unreliable clock.

This one gains exactly 15 minutes every hour.

It is now showing 3.00am and you know that is was correct at midnight, when you set it.

The clock stopped four hours ago, what is the correct time now?

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[Ref: ZSIE] © Kevin Stone 


Difficulty: EasyPuzzle 284

Puzzle IconI started a journey to my Aunt's yesterday with a full tank of gasoline, 10 gallons, but at that exact moment my gasoline tank sprang a leak.

I managed to drive 50 miles, exactly one hour, before coming to a complete stop with an empty tank.

I know that the car manages 25 miles per gallon.

How quickly was I losing gasoline?

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[Ref: ZRNJ] © Kevin Stone 

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[Added September 1997]

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