confused on “rate” description

Question

Natalie chopped 64 carrots in 16 minutes. Find her chopping rate in carrots per minute. 

4 per minute 

What is the RATE though? 

Answer 1

64/16=x/1

16x=64

/16 /16

x=4

the rate is 4 carrots per minute. The rate means the speed at which she chops carrots.