One evening Mr. Green is driving his car in the country and looking for a small hotel. When he sees an old man on the side of the road, Mr. Green stops his car and says to the old man, 'I want to go to the Sun Hotel. Do you know how to get there?' 'Yes, of course,' the old man answers, 'I will show you the way. Please let me sit in your car. I can go with you and tell you where to turn.' He gets in Mr. Green's car. They drive about twelve miles . When they come to a small house, the old man says, 'Stop here.' Mr. Green stops his car and says, 'But this isn't a hotel.' 'No,' the old man answers. 'This is my house. Thank you very much for driving me home. And I'll show you the way to the Sun Hotel. Turn around and go back nine miles. Then you will get to the hotel.' How far does Mr. Green drive when he comes to the Sun Hotel at last?
3 miles 12 miles 21 miles 9 miles