Surprising result of calculating speeds of two cars hitting a tree

[Wanderfound]

@bryan

@Aeroplane

People shouldn’t be doing calculations in their heads while driving

I do a basic form of quantity surveying on monotonous highway drives: whenever I pass a sign telling me the distance to a given town, I try to work out what time I’ll pass that town.

Recreational mathematics is a standard way to pass the time on long motorcycle trips. Converting your speed into furlongs per fortnight was always a favourite.