Here's a question that I'm interested to know how people will answer:
I'm travelling by car. If I drive for half the journey at 60mph and half the journey at 40mph, what will be my average speed for the whole journey? How did you work it out?
@alisonkiddle common north america thing to measure travel by time rather than distance :D
@annika we do it here in the UK too - this morning's journey was 1 hr 25 minutes, I have no idea how many miles it was