The other day I heard a good Camel Trophy-based Puzzler question on Car Talk. The basic gist of it was this: in qualifying for the Camel Trophy, one member of each two-man team was asked to drive a certain course. The other team members were then asked to drive the same course in as close to the times of their partners as possible. All this was to be done without clocks or watches.
The winning team got very close to the same time. How did they do it?