by Michael Fletcher
My six mile journey into the city centre consisted of six one mile legs, each of which I had driven at a steady speed of a whole number of miles per hour. I did not exceed the 20 miles per hour speed limit on the first leg and my speed on each subsequent leg was less than that on the leg that preceded it.
I calculated that the average speed to the end of each leg had been a whole number of miles per hour.
How long did the journey take?