Read and choose the best answer.Mr. Black’s office was only 5 kilometers away from his house, so he could go home to have lunch every day. But when he got home at noon, he had to drive another place to park his car, then walked back home. Because he found many cars outside his house and there was no room for his own car. This made him very angry.One day, he put up a board in the garden facing the roadNO PARKINGBut nobody noticed it. People seemed to obey only a police notice with white letters on a blue board.POLICE NOTICENO PARKINGMrs. Black asked his husband to steal a police notice but he was afraid to do so. Then she asked him to make one just like a police notice. Mr. Black said he was not the police and couldn’t use the word “police”. Several days later, Mr. Black made a blue board with white letters.POLITE NOTICENO PARKING“Oh!” Mrs. Black said, “ You told me you weren’t going to use the word ‘police’, but why do you use it now”“Really” he asked with a smile. “Look again!”“Oh, Dear!” she started to laugh, “ You are really clever!”1. How far is it from Mr. Black's house to his office？