Mr. and Mrs. Green were going on their vacation with their children, and they had to arrive at the airport before 11:40 the next morning. "It takes us thirty minutes to get there in a car," Mr. Green said, "so we must get ready before eleven o'clock. Don't be late." At ten fifty, all of them were busy doing something, but Mrs. Green wasn't. She sat quietly in a chair in the garden and enjoyed the good weather. Mr. Green and the children were surprised, but Mrs. Green said, "Don't worry! Before I went to bed last night. I made all our clocks and watches twenty minutes ahead . Now we can get to the airport early." What time was it when Mr. Green and the children were busy doing things?
It was ten fifty. It was eleven ten. It was ten thirty. It was eleven forty.