Final answer:
Without the distance between Point A and Point B, it's not possible to calculate the travel time at a speed of 20 knots, as the time depends on the distance to be covered.
Step-by-step explanation:
To determine how long it will take to travel from Point A to Point B at a speed of 20 knots, we need to know the distance between Point A and Point B. Without the distance, we can't calculate the travel time. However, if we had the distance, we would use the formula:
Time (hours) = Distance (nautical miles) / Speed (knots).
One knot is equal to one nautical mile per hour. For example, if the distance were 100 nautical miles, it would take 5 hours to travel the distance at 20 knots.