There are 80 soldiers who want to cross a 281-meter-long bridge. There are 4 people in a row, and the distance between each row is 1 meter. The speed of the soldiers is 4 meters per second. How many minutes will it take.
有80名战士要过一座281米长的大桥，每4人排一横行，每行之间相距1米，战士们前进的速度是每秒4米，这支队伍从上桥到下桥，共需要多少分钟．
<result>1.25</result>