Covering ground quickly

[golfdsg]

How is it possible to drive 200 miles, whilst not exceeding 70mph, yet reaching the destination faster than somebody travelling at 80mph.

I was reading a thread on here (cant seem to find it now) where a bloke would regularly travel to work using the motorway at 70mph, and a work colleague travelling in the same direction would be speeding past him at 80mph+, yet he would get to work earlier than his colleague.

So I was wondering, how is it possible to increase the average speed over 200 miles, keeping to the speed limit, yet reaching the destination faster than speeding vehicles.

Thanks

[golfdsg]

Thanks for all your input everybody. I was only wondering this as I have a 220 mile journey to make on Friday which will be done on the A1.

I would like to complete my journey as fast as possible whilst not exceeding the legal speed limit. Google maps says 4h20, I like to get that to under 4hours.