Question

after the first 15 minutes of laying cement you had used 1/5 of the bag. What is the rate you are laying cement in bags per hour? What is the unit rate

Answer 1

1 hour=60 minutes

So 15 minutes=1/4 of a hour

Multiply 4 by 1/5=4/5 of the bag

The unit rate is that in 1 hour, 4/5 of the bag is used

Answer 2

15*4=1 hour
1/5*4=4/5 or 80% of the total bag
you are laying 4/5 of a bag in 1 hour given the rate is constant