科研之友
微信
新浪微博
Facebook
分享链接
摘要
<正>Three men were trapped on an is-land and the nearest shore was 50 milesaway.The first man swam trying to makeit to the other shore. He swam 15 milesand drowned.The second swam 24 miles anddrowned.The third man swam 25 miles andgot tired. So he swam back.
