The time-speed-distance function of a flight computer can help calculate which of the following?

The time-speed-distance function of a flight computer is primarily used to relate the three essential variables involved in a flight: time, speed (or groundspeed), and distance. This function allows pilots to calculate how long it will take to reach a destination based on the distance to be covered and the speed at which the aircraft is traveling.

In the context of fuel consumption, understanding groundspeed aids in estimating how much fuel will be needed for the duration of the flight. This is particularly important for flight planning and ensuring sufficient fuel reserves are available, as fuel consumption is directly related to both the duration of the flight and the speed of the aircraft.

While altitude and fuel efficiency, heading and distance, or weight and balance are critical elements of flight operations, they do not specifically fall under the time-speed-distance calculations that are core to the flight computer's function. The primary focus of this function is the relationship between time, speed, and distance, making the ability to calculate groundspeed and fuel consumption the correct context for this scenario.