ali's typing rate between 8:00 am and noon is 48 words per minute. after lunch a lunch break, Ali's typing rate between 1:00 pm and 4:00 pm is 2,040 words per hour. what is Ali's average typing rate per minute for the whole time she works?

41 word/min

Step-by-step explanation:

Before noon Ali works:

4 hours = 4*60 min = 240 min

She types:

240*48 = 11520 words

After lunch she works:

4 hours

She types:

4*2040 = 8160 words

Total Ali works = 4+4 = 8 hours = 480 min

Total Ali types = 11520+8160 = 19680 words

Average typing rate = 19680 words/480 min = 41 word/min