9. A team of 8 people participates in a sports tournament. The rules stipulate that there must always be 5 players on the field for each team and that, during each match (which lasts 60 minutes), all 8 members of each team must play the same number of minutes. For how many minutes will each player be on the field during the match?
(A) less than 30
(B) between 30 and 33
(C) between 33 and 36
(D) between 36 and 39
(E) more than 39
Problem 9. The answer is (D).

The total number of minutes played by the members of each team during a match is $60 \cdot 5=300$. These 300 minutes must be evenly divided among the eight team members. Each player will therefore be on the field for $300 / 8=37.5$ minutes.

(Problem proposed by F. Caceffo)