It’s Friday Puzzle!

If you are up at the Edinburgh Festival, I shall be talking about the strange science of sleep and dreaming on August 14th.  Do come along, much fun will be had. Details here.

Here is this weeks puzzle.  Two cyclists are racing around a circular track.  Jon can race around the track in 6 minutes and Eric can race round in 4 minutes.  They start the race on opposite sides of the track.  How many minutes will it take before Eric overtakes Jon?

I have produced an ebook containing 101 of the previous Friday Puzzles! It is called PUZZLED and is available for the Kindle (UK here and USA here) and on the iBookstore (UK here in the USA here). You can try 101 of the puzzles for free here.