Quote:
Originally Posted by pdurrant
The average speed would be 50mph if they had driven for three hours at 40mph and then 3 hours at 60mph (perhaps a longer route home). But they didn't. They only drove for 2 hours at 60mph.
So their average speed was ((3*40)+(2*60))/5 = 48 miles per hour.
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Well yes, of course, it's blindingly obvious (as is everything when somebody more able tells you the answer).
Seriously, I like to think that I'm not stupid, but I just couldn't see that until I was told
