39. Two copy machines copy at the same rate and will both be used to make copies of a report. At 8:00 a.m., both machines begin copying. One of the machines breaks down at 11:00 a.m. and begins copying again at 2:00 p.m. Both machines finish copying at 5:00 p.m. when the copying of the report is complete. One of the following graphs shows n, the number of copies made, as a function of t, the time at any given point during the copying. Which graph is it?

Answer and Explanation

Your Answer is

Correct Answer is A

Explanation

One of the two machines does not work from 11 o'clock to 2 o'clock, so the total work speed of this time period is slower than other time periods, that is, the slope is smaller than other time periods. Therefore A.