Brainteasers

[Johann]

TruckOSaurus said:
@Johann : You were right this brainteaser is really hard. I don't know where to begin to solve it.

If you don't mind, I'll add another brainteaser to keep the thread going while we all try to figure it out yours (and nordlead's puzzle too!)

So here's mine :

You have 25 horses who all run at a constant speed but not one of them at the same speed. The track only has 5 lanes so you can only race 5 horses at a time. What's the least amount of races that you need to identify the 3 fastest horses.

 

I`m glad I`m not the only one who thinks so! I lost so many nights of sleep over the damn thing, I was starting to think that maybe I was just too dumb to understand it!

I`ll give your horse problem a shot:

5 races: Race all the horses (using a timer) and compare the lap times of the winners to find out who the fastest are.