What happened to Mrs. Grey’s car one morning?

[17B]Mrs. Grey lived in the country, but she worked in London. She always drove to the railway station in her car every morning, and left it in the station car park until she arrived back in the train in the evening. She was a careful driver, but one morning she was rather late, so she was going faster than usual when she had an accident in a narrow road not far from her home.
    What happened was that another car was coming in the opposite direction, and either that one or Mrs. Grey’s car was too far in the middle of the road, or perhaps both of them were. [18C]They ran into each other and both were damaged, although not enough to stop them being driven. [l9A]Since both Mrs. Grey and the other driver, a young man, were too busy to deal with the accident at the time, Mrs. Grey suggested that they would go away in their cars, and then would come back to the scene of the accident at six o’clock that evening, and put them in exactly the same position as they were in the morning. Then they could call the police. The young man agreed happily. After they exchanged visiting cards, each drove off to carry on with their work.
    When Mrs. Grey arrived at the station from London at 5:45 that evening, she got into her car, drove to the place where the accident had happened, and found [20D]the young man waiting there in his car. They put both cars in exactly the same positions as they had been in after the accident, and then Mrs. Grey called the police, using the telephone in her car, as if the accident had just happened.