一段300 miles的路程,如果某人用20 miles less than normal speed走,要多用45minutes,问这个人的normal speed是多少
说一个slink,由drink + toppling组成。然后说一种slink,可以从one of two crafters, 2 available of 8 toppling and 1 of 3 drinks 挑选组合而成. Only same toppling and same drink can consider as one type of slink. 问有多少种不同的slinks with two different topping.