Answer:
a.
miles per hour
b.
customers per day
c.
meters per second
d.
dollars per pound
Step-by-step explanation:
We need to find the unit rate in each of the following.
Let us consider one by one.
a. 420 miles in 7 hours
To find the unit rate, we need to divide 420 by 7.
So, unit rate is 
miles per hour
b. 360 customers in 30 days
To find the unit rate, we need to divide 360 by 30.
So, unit rate is 
customers per day
c. 40 meters in 16 seconds
To find the unit rate, we need to divide 40 by 16.
So, unit rate is 
meters per second
d. $7.96 for 5 pounds
To find the unit rate, we need to divide 7.96 by 5.
So, unit rate is 
dollars per pound