The volume of a rectangular prism can be calculated using this formula:
Where "l" is the length, "w" is the width and "h" is the height.
In this case, you know that the dimensions of the section are:
Therefore, substituting values into the formula and evaluating, you get that its volume is:
According to the explanation given in the exercise, each person requires this volume of air space:
Then, to find the number of people it can hold, you need to set up that:
Hence, you get:
Therefore, the answer is: 90 people.