Answer:
The correct answer is 7.54 foot apart.
Step-by-step explanation:
The height of the Cap San Juan Lighthouse is 45 foot.
The angle of depression of the first boat is given to be 40°.
Distance between the first boat and the lighthouse is cos 40° × 45 = 34.47 foot.
The angle of depression of second boat is given to be 21°.
Distance between the second boat and the lighthouse is cos 21° × 45 = 42.01 foot.
Therefore the boats are 42.01 - 34.47 = 7.54 foot apart from each other.
