Yesterday I discovered that I walk at a speed of around 100 metres per minute.
Zoe had asked me how far I walked each day so I was trying to measure my walk to the station on a map. For some reason I chose to measure it in kilometres rather than miles, as I normally would, and the resulting 2.4 km rang a bell: it takes me about 24 minutes to cover that distance each morning - an average speed of 100 metres per minute. As a check I measured the other end of my daily journey, from Farnborough North to Frimley, with a similar result: 2.3 km, and that takes me about 23 minutes. Again 100 metres per minute.
I wish I had known this when I was younger. Being able to accurately estimate how long it would take me to walk somewhere could have saved me a lot of time when added up over the years. Also, it would have been cool to be able to accurately estimate distances just from how long it took me to walk them.