Ryanair Initial Practice Exam

What is the duration of the 120L oxygen bottle on high flow at 4 litres per minute?

1. 30 minutes

2. 60 minutes

3. 77 minutes

4. 154 minutes

The correct answer is: 30 minutes

To determine the duration of a 120-liter oxygen bottle on high flow at a rate of 4 liters per minute, we can use a straightforward calculation. First, we need to divide the total volume of oxygen available in the bottle (120 liters) by the flow rate (4 liters per minute). So the calculation goes as follows: 120 liters ÷ 4 liters/minute = 30 minutes. This shows that the oxygen bottle will last for 30 minutes when used at a flow rate of 4 liters per minute. In the context of this question, if one looks at the other options, they represent durations that do not align with the flow rate provided. The duration is directly proportional to the total liters divided by the rate of usage, making 30 minutes the only viable answer given the provided conditions. This straightforward calculation confirms that the correct answer matches the practical understanding of how long a fixed volume will last when consumed at a constant rate.