Answer:
miles driven
hours driven
Step-by-step explanation:
Let us call the number of hours driven, and the number of miles traveled by a truck. Since on a particular day, the driver drove 30 miles per hour, we have:
And since the total expenses for the driver and the truck were $820, we have:
<em>(this says $20 per hour driven, and $2.75 per mile traveled must equal $820)</em>
Thus we the system of equations:
From the first equation we get , and we put this into the second equation to get:
solving for , we get:
Putting this value of into we get