A speedreader can read 75 words in 1/4 of a minute. How many words can they read per minute? Which expression will determine the unit rate of words per minute?

1/4 divided by 75
75 divided by 1/4
neither
both

To find the number of words a speedreader can read per minute, divide the number of words read in 1/4 of a minute by 1/4.

So, the expression that determines the unit rate of words per minute is 75 divided by 1/4.

Therefore, the answer is 75 divided by 1/4.