１９世纪一次国际科学会议期间，法国数学家柳卡向与会的数学家提出了如下问题：假定某轮船公司每天中午都有一艘轮船从哈佛开往纽约，并且每天的同一时刻也有一艘轮船从纽约开往哈佛，轮船在途中所花的时间来去都是７昼夜，而且都是匀速航行在同一航线上．问：今天中午从哈佛 During an international science conference in the 19th century, the French mathematician Liuka asked the mathematicians at the meeting the following questions: Suppose a ship company had a ship from Harvard to New York every day at noon, and there was a ship from New York at the same time every day. For Harvard, the time it takes for the ship to come and go is seven days and nights, and it is all on the same route. Q: From Harvard at noon today