Answer
The mass of the car is 1900 kg
Work Step by Step
We can find the upward force exerted on the car.
$F = 4\times P~A$
$F = (4)(2.4\times 10^5~N/m^2)(190\times 10^{-4}~m^2)$
$F = 18,240~N$
We can use this force to find the mass of the car.
$Mg = F$
$M = \frac{F}{g}$
$M = \frac{18,240~N}{9.80~m/s^2}$
$M = 1900~kg$
The mass of the car is 1900 kg.