Final answer:
After calculating the words per minute for each student, Bob proves to be the fastest typist with a rate of 126.87 words per minute, outpacing both Marc and John.
Step-by-step explanation:
In order to determine which student can type at a greater rate of words per minute, we need to calculate the typing speed of Marc, John, and Bob in words per minute.
- Marc can type 80 words in 1.5 minutes, which is a rate of 53.33 words per minute (80 divided by 1.5).
- John can type 90 words in 1.33 minutes, which is a rate of 67.67 words per minute (90 divided by 1.33).
- Bob can type 85 words in 0.67 minutes, which is a rate of 126.87 words per minute (85 divided by 0.67).
Comparing the rates, Bob can type at the greatest rate of 126.87 words per minute, making him the fastest typist among the three students.