While navigating in fog off a coastline of steep cliffs, you hear the echo of the ship's fog horn 3 seconds after the signal was sounded. What is the distance to the shore?

Correct Answer: Option B — 550 yards

Sound travels at roughly 1,100 feet per second. With a 3-second round-trip echo, the sound traveled for 1.5 seconds to reach the target. 1.5 seconds multiplied by 1,100 feet per second equals 1,650 feet. Dividing by 3 feet per yard results in exactly 550 yards, the distance to the reflecting cliff.