求教两道数学题

shiningsmile

ds：m和r是数轴上两个数
1、the distance between r and 0 is 3times the distance between m and 0
2/12 is halfway between m and r
我结合12算了r=18可是答案选E，难道还有其他可能，望NN提示

第二题k是正整数，is k the square of an integer?
1 k is divisible by 4
2 k is divisible by exactly four different prime numbers

shiningsmile

呜呜，NN们哪去了？