Roberta does more total work than Mary. Mary does more total work than Roberta. Roberta has a greater power output than Mary. Mary has a greater power output than Roberta.
Two students each carry a box up to the third floor of a building. The total mass of each student and the box she is carrying is the same. Roberta makes the trip in 45 s while Mary takes 30 s. Which of the following statements best describes this task?

Options:
- Roberta does more total work than Mary.
- Mary does more total work than Roberta.
- Roberta has a greater power output than Mary.
- Mary has a greater power output than Roberta.

Mary has a greater power output than Roberta.