I normally post these on Friday, but the happiness project has taken over my life, and so I decided to post the puzzle today.
I try to vary the puzzles as much as possible, both in terms of how hard they are and the skills needed to solve them. This one is from my colleague Mike, and is a tad trickier than most…..
As part of a rather odd driving challenge you are required to complete two laps of a racetrack at an overall average speed of 80mph. At the instant you finish the first lap, you are informed that your average speed over that first lap was
only 40mph. How fast do you need to travel over the second lap to get your
overall average speed up to the target value of 80mph?