The Policeman’s rate of change is $10 per hour and the firefighter's rate of change is $10 per hour
How to determine the rates of change
The Policeman’s rate of change
From the question, we have the following parameters that can be used in our computation:
The graph
On the line of the policeman, we have the following point
(x, y) = (4, 40)
So, the rate of change is
Rate = y/x
This gives
Rate = 40/4
Evaluate
Rate = 10
The firefighter's rate of change
On the line of the firefighters, we have the following point
(x, y) = (4, 60)
So, the rate of change is
Rate = y/x
This gives
Rate = 60/4
Evaluate
Rate = 15
Hence, the rate is $15 per hour
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