Question 715Navigation General

The correct answer is D) 825 yards. The distance to the shore can be calculated using the speed of sound in air, which is approximately 1,100 feet per second. Since the echo of the fog horn was heard 4 1/2 seconds after the signal was sounded, the distance to the shore can be determined by multiplying the time (4.5 seconds) by the speed of sound (1,100 feet per second), which gives a distance of 825 yards. The other options are incorrect because they do not accurately reflect the distance based on the given information. For example, option A (405 yards) and option B (628 yards) are too short, while option C (730 yards) is too long compared to the correct answer of 825 yards.