$($a$)$ A rectangular gasoline tank can hold $39\mathrm{.}0$ kg of gasoline when full. What is the depth of the tank if it is $0\mathrm{.}450$ m wide by $0\mathrm{.}900$ m long? FYI, the table of densities in the textbook refers to gasoline as "petrol". $\backslash (\backslash$times $\backslash$quad $\backslash$mathrm$\{$m$\}\backslash )$

$($b$)$ What is the volume of the tank? $($It is suitable for a passenger car.$)$gal