Please solve in mathematica

Gasoline engine efficiency

The drag force $F$ on a car moving at velocity $v$ is $F=C{d}^{**}(\frac{1}{2})$ rho $v^{2}A,$

where $Cd$ is the drag coefficient, A the frontal area, and $=1\mathrm{.}225k\frac{g}{m^3}$ the density of air.

The work done per unit distance against the drag force is $F.$

a$)$ A VW Golf GTI has a drag coefficient Cd equal to $0\mathrm{.}35,$ and frontal area A of $1\mathrm{.}91m^2.$

What is the work done per unit distance against drag $($in $\frac{J}{m})$ at $70mph?$

b$)$ The heat of combustion of gasoline is $45M\frac{J}{k}g,$ and its density is $0\mathrm{.}77k\frac{g}{L}.$

A VW Golf GTI gets about $40mpg$ on the highway at $70mph$ on level roads.

How much chemical energy per distance traveled $($in $\frac{J}{m})$ is consumed by at $70mph?$

c$)$ What is the efficiency of the engine $($work done per energy consumed$)?$