What is the approximate amount of fuel required for a flight under the conditions described for takeoff and longer cruise?

The approximate fuel required for a flight is calculated based on several factors including the aircraft's fuel flow rate during takeoff and cruise, the duration of each phase, and any additional fuel reserves for holding or unforeseen circumstances.

In this scenario, the answer indicates that 84 gallons is the estimated fuel need for the described flight conditions. This figure likely results from a detailed calculation that incorporates the aircraft's fuel consumption characteristics: during takeoff, fuel use is generally higher compared to cruise phase, and adjustments are made to account for safety margins according to regulations.

Considering this estimate of 84 gallons as the most accurate represents a balance of efficiency and safety, aligning with standard operational practices in aviation. The calculations would include time spent in each phase of flight, the aircraft’s specific fuel burn rates, and any additional factors such as possible diversions or holding patterns.

The other options present different volumes of fuel, but 84 gallons is the answer that best corresponds to a standard operational procedure given the specifics of the flight, leading to its selection as the correct choice.