Goal= 800 yards.
For every 200 yards he pushes in an hour, he ends up resting and it goes back a 100 yards the next hour after.
so (200-100)+(200-100)+(200-100)+(200-100)+(200-100)+(200-100)+(200).
2 hours + 2 hours + 2 hours + 2 hours + 2 hours + 2 hours + 1 hour = 13 hours.
So it will take 13 hours for Mr. Bean to push up his car up to the gas station.