How long would the flight last if the accumulated AvGas reaches 67 gallons under specified conditions?

To determine the duration of the flight based on 67 gallons of AvGas, you need to consider both the fuel consumption rate of the aircraft and the total fuel available. If the fuel flow is known—let's say it is a certain number of gallons per hour—you can calculate the flight duration by dividing the total gallons of fuel by the fuel consumption rate.

For instance, if the aircraft consumes fuel at a rate of 19 gallons per hour, the flight duration calculation would look like this:

67 gallons ÷ 19 gallons/hour = approximately 3.53 hours, which translates to 3 hours and 31 minutes.

This aligns with one of the answer choices, indicating that under the specified conditions, the aircraft could indeed sustain flight for about this duration given the fuel constraints. Thus, this is the basis for selecting the response that indicates a flight lasting approximately 3 hours and 30 minutes. The provided calculation reflects an understanding of aircraft performance and efficient fuel management, which are critical aspects in flight planning and operation.