Nathan owns a trucking company. For every truck that goes out, Nathan must pay the driver $20 per hour of driving and also has an expense of $2.75 per mile driven for
gas and maintenance. On one particular day, the driver drove an average of 30 miles
per hour and Nathan's total expenses for the driver, gas and truck maintenance were
$820. Write a system of equations that could be used to determine the number of
hours the driver worked and the number of miles the truck drove. Define the
variables that you use to write the system.