How is speed in knots calculated based on distance and time?

Speed in knots is calculated by taking the distance traveled in nautical miles and dividing it by the time taken to travel that distance in hours. Since a knot is defined as one nautical mile per hour, the correct method involves using the formula for speed: distance divided by time.

To specifically express this in knots, the time must be in hours. However, if time is provided in minutes, you need to convert it to hours for the calculation to be accurate. Since there are 60 minutes in an hour, if the time is given in minutes, dividing distance by time in minutes will give speed in nautical miles per minute. To convert that to nautical miles per hour, you multiply the result by 60, which effectively gives you the speed in knots.

Thus, the calculation involves taking the distance divided by time and multiplying by 60 to convert from minutes to hours. This explains why the choice that states to multiply by 60 minutes is correct.