You can use Bing Maps as an online distance calculator to quickly estimate the total air and road distance between any two cities or countries of the world.
You have a business meeting and you want to arrive fresh but the change in time zones is showing up on your face.
When traveling across a number of time zones, the body clock will be out of synchronization with the destination time, as it experiences daylight and darkness contrary to the rhythms to which it has grown accustomed.
It so happens that you know the exact road directions for reaching a particular point in the city but have no clue about the postal address of that place.