You are in a line at the bank drive-through and 9 cars are in front of you. You estimate that the clerk is taking about four minutes per car to serve.How long do you expect to wait in line?
What i would do is multiply the 9 cars by 4 because I need to take the 4 minutes and apply it to all the cars in front of me. 9 x 4 = 36. I calculate that I would wait 36 mins for it to be my turn.
