Sunday Times Teaser 2731 – Snarl Up
by Michael Fletcher
Published: 25 January 2015 (link)
I had to drive the six miles from my home into the city centre. The first mile was completed at a steady whole number of miles per hour (and not exceeding the 20mph speed limit). Then each succeeding mile was completed at a lower steady speed than the previous mile, again at a whole number of miles per hour.
After two miles of the journey my average speed had been a whole number of miles per hour, and indeed the same was true after three miles, after four miles, after five miles, and at the end of my journey.
How long did the journey take?