Assuming that each person's rating is independent of another person's rating, this can be solved using the notion of independence. Some hints:
if event A and event B are independent:
1) P(event A occurring AND event B occurring) = P(event A occurring) $\times$ P(event B occurring)
2) Be careful though, in this question, they don't specify who is person A and who is person B. That is, either person could be A or B. This adds a slight wrinkle that you need to be aware of. For example, imagine Joe is person A and Jane is person B. But Joe can also be person B and Jane could be person A.