Question

machine a covers 5/8 square feet in 1/4 hour or machine b covers 2/3 square feet in 1/5 hour

Answer 1

Answer:

The unit rate of machine A : 2 1/2 square feet per hour

The unit rate of machine B : 3 1/3 square feet per hour

So machine B has the greatest rate

Step-by-step explanation:

1st step: 5/8 divided by 1/4...You use KCF (keep/change/flip)

5/8 times 4/1 = 20/8 = 2 4/8 =  2 1/2

2nd step: 2/3 divided by 1/5...You do KCF again and you get

2/3 times 5/1 = 10/3 = 3 1/3

And if you know your numbers then you know that 3 1/3 is larger than 2 1/2 so machine B has the greatest unit rate.