While navigating in fog off a coastline of steep cliffs, you hear the echo of the ship's fog horn 4 seconds after the signal was sounded. What is the distance to the shore?

Correct Answer: Option D — 730 yards

The speed of sound in air is approximately 1,100 feet per second. Using the echo ranging formula, distance equals (speed of sound × time) / 2. With a 4-second delay, the total travel distance is 4,400 feet; dividing by 2 gives 2,200 feet, which is approximately 733 yards.