Answer:
3/5
Explanation:
1 (the goal, or amount of pages) divided by 1/3 (the number of pages he writes per 1/5 minute) = 3
Now, we can't forget that this isn't 3 minutes, it's 3/5 of a minute because you then have to multiply the answer by the time. 3 x 1/5 is equal to 3/1 x 1/5, or 3/5.
So, to summarize, every 1/5 of a minute he writes 1/3 of a page. 1/3 + 1/3 + 1/3 or 1/3 x 3 is equal to 1, or 1 whole page. 1/5 + 1/5 + 1/5 or 1/5 x 3 is equal to 3/5, or the number of minutes.