Answer:
1.6 hrs remaining, or 3.12 km/h
Step-by-step explanation:
Answer:
1450
Step-by-step explanation:
this is actually mental math
If Ann cleans in 12 hours then she cleans

of the apartment per hour. Similarly Liz cleans

of the appartment per hour. So together then can clean

of the apartment for hour. Therefor it will take them

hours to clean.
The general formula

can be used as a check if needed.
What are you supposed to do?
7x+1000+x=89000
7x+x+1000-1000=89000-1000
8x=88000
8x/8=88000/8
x=$11000