中科新闻网喝酒认怂书文档:Math!!!Math~~~~
来源：百度文库 编辑：中科新闻网 时间：2024/05/12 12:25:29
It took Sam 200 minutes to complete the difficult Sunday Times crossword puzzle. Stanley did the same puzzels in 160 minutes. By what frraction of an hour was Sam's time longer than Stanley?
(200-160)/60=40/60=2/3