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## Homework Statement

The train is travelling in a gallery at ##v=70 km/h##. Outside air is not moving and pressure is ##p_0=101325 Pa## and temperature ##T=283 K ##. The area of the face of the train is ##A=9 m^2##. Determine the minimum area of the section of the gallery such that the pressure inside the train does not go down ##P=90000Pa##

## Homework Equations

Bernoulli equation

## The Attempt at a Solution

I cannot really relate the Surface of the sections of train or the gallery with the pressure difference, what is the relation that one should use?