Fiona cleans offices. She is allowed 5 seconds per square foot. She cleans building A, which is 3,000 square feet, and building B, which is 2,460 square feet. Will she finish these two buildings in an 8-hour shift?

Yes

Since the time taken t= 7.58 hours required to complete both buildings is less than the 8-hours shift then she can finish the two buildings.

Step-by-step explanation:

Given;

Building A = 3,000 square feet

Building B = 2,460 square feet

Total area of building A and B = 3,000+2460

= 5460 square feet

Rate = 5 seconds per square foot

Time taken to complete both buildings is;

Time t = Total area × rate per area.

t = 5460 × 5 seconds

t = 27300 seconds

t = 27300/60 minutes = 455 minutes

t = 455/60 hours

t = 7.583333333333 hours

t = 7.58 hours

Since the time taken t required to complete both buildings is less than the 8-hours shift then she can finish the two buildings.