Answer: Ok, so we know that zoe wrote 3/5 of her essay in 30 minutes.
Now, assuming she wrote the paper at a constant rate, then if we divide those 3/5 in 3, we get 1/5 + 1/5 + 1/5, t we also divide the time by the same number, then:
1/5 + 1/5 + 1/5 = 10m +10m +10m
so she wrote a 1/5 of her essay in 10 minutes.
if we divide by 10 this time, we get 1/50 = 1 minute.
then she wrote 1/50 of her essay per minute.