Answer:
This is a guess but I think it's 5 min per table.
Explanation:
The reason being:
if we know that she has 9 tables to get to and each table can seat 4 people, we would have to multiply both numbers to find how many TOTAL people are in the restaurant during the first few hours.
9x4 = 36 people in total
then, we need to convert 3hrs into minutes to get a more accurate rep as to how much time she would spend at each table (she isn't going to spend the entire 3 hrs with only one table now, is she?)
so for this, we convert 3hrs into minutes
1 min = 60 secs
1 hr = 60 minutes
3hrs -> 60 x 3 = 180 minutes
now, to understand how many time she spends at each table, we need to figure out by dividing the # of people by the amount of minutes.
180 minutes/36 people = 5 mins per table.