i always tell people when i am driving 25 in a 25 instead of doing 30 that it doesnt matter because on the short drive it doesnt make a real time difference (especially when you catch up to the person who just passed you sitting at a red light)
so anyhow to prove my point, i made a spreadsheet that shows the time required for a trip while maintaining consistent speed (no stops) i was surprised by some of the results, so play around with the speeds and distance (even though i labeled mph and miles you can put in km/h and km) have fun and feel free to use it to prove your point the next time your spouse yells at you for going 55 instead of 70 on a 10 mile trip
john
p.s. sorry of anyone already posted a novelty like this and i missed it