What was your question that was never answered?
Answer:
Machine B
Step-by-step explanation:
Since, Machine A covers
square feet in
hours,
Rate at which the Machine A is covering = 
= 
= 2.5 square feet per hour
Machine B covers
square feet in
hours,
Rate at which the Machine B is covering = 
= 
= 
= 3.33 square feet per hour
Therefore, Rate of Machine B is greater.
Answer:
81 inches
Step-by-step explanation:
To find the volume of a rectangular prism you multiply the width × the height × the length.
So it would be 3×9×3 which equals to 81 inches