While navigating in fog off a coastline of steep cliffs, you hear the echo of the ship's fog horn 4 1/2 seconds after the signal was sounded. What is the distance to the shore?

Correct Answer: Option D — 825 yards

Sound travels approximately 1,100 feet per second in air. Total travel time is 4.5 seconds for the round trip, giving a one-way distance of (1100 * 4.5) / 2 = 2,475 feet, which equals 825 yards.