Answer:
5.76 km/h
Step-by-step explanation:
After the first hour, the ships are 5.76 km apart. That separation rate remains constant since the speed and direction of each ship remains constant.
Distance between the ships is increasing at 5.76 km/h.
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A triangle solver is a useful tool for this. The Law of Cosines can also be used to find the distance between the ships after 1 hour.
c² = a² + b² - 2ab·cos(C)
c² = 13² +17² -2·13·17·cos(16°) ≈ 33.1223
c ≈ √33.1223 ≈ 5.755 . . . . km
The distances are all proportional to time. The separation distance increases each hour at the same rate it did in the first hour:
5.76 km/h
