That's because day 1 no longer counts against the 70 hour limit (you are only required to count the current day and the previous 7 days for 8 days total). Since the driver had -5 hours available and 10 hours fell off the calculation, the driver had a total of 5 hours available on the 70 hour limit.
How many countries are there in the world? Since South Sudan became an independent state on 9 July 2011, there are now 195 independent sovereign nations in the world (including disputed but defacto independent Taiwan), plus about 60 dependent areas, and five disputed territories, like Kosovo.
There are about 27,000 places in the U.S. and 304 million people. Based on a world population of 6.7 billion, there are close to 600,000 cities, towns, villages, hamlets etc. in the world. There are 650,000 villages (towns and cities included) in India for a polulation of 1billion+. That is a sixth of world population. On the same scale, there should be 6 X 650,000 = 3,900,000 villages, towns and cities in world. The earth is not a mathematical problem.