Answer:
D. 60m = w
Explanation:
The rate is 60 words per minute.
In 1 minute, he types 60 words.
In 2 minutes, he types 2 * 60 words
In 3 minutes, he types 3 * 60 words
In m minutes, he types m * 60 words.
m * 60 can be written as 60m.
The number of words, w, he writes in m minutes is 60m.
w = 60m or 60m = w
Answer: D. 60m = w