Answer:
it will take Lisa 12.5 hours
Explanation:
first figure out how many minutes it takes her per apartment.
in 2.5 hours is 150 minutes so divide 150 by 6 = 25
So, it takes her 25 minutes per apartment.
next, find out how many minutes it takes her to clean 30 apartments by:
30* 25= 750 minutes for 30 partments
divide 750 by 60 to find out how many hours
12.5 hours.