Paul can type 60 words per minute and jennifer can type 80 words per minutes. how does paul's typing speed compare to jennifer's

Can somebody me out with this question

What is the similarity ratio of a cube with volume 729m^3 to a cube with volume 3375 m^3

Acyclist bike x distance at 10 miles per hour .and returns over the same path at 8 miles per hour.what is the cyclist average rate for the round trip in miles per hour ?