You need to explain to us what to do or else nobody will understand what your trying to ask for.
The answer is 8 batches of cookies
The answer is the fourth one. Trust me I had the same question
Perform the indicated division, if any.
Rate: (500 miles)/(20 hours)
Unit rate: (500/20) miles/hour = (25 miles)/(1 hour) = 25 miles/hour
A unit rate is a rate with one unit in the denominator.