1. 如果让你把6把不同颜色的椅子排成一排,有多少种排列法?
答案：6*5*4*3*2*1 = 720种
2. A和B同时同方向向165公里以外的终点出发.如果A比B早0.8小时抵达终点,而当A到的时候B还有24公里没走,那么A在旅途上共花费多少时间?
(1/0.8)*24 = 30km/h (B的速度）
所以B共花了165/30=5.5小时
A花了5.5-0.8=4.7小时
英语翻译1、if we ask you to put 6 different-color chairs into one
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