#### Problem Statement: ECE Board November 1991

The captain of a ship views the top of a lighthouse at an angle of 60° with the horizontal at an elevation of 6 meters above sea level. Five minutes later, the same captain of the ship views the top of the same lighthouse at an angle of 30° with the horizontal. Determine the speed of the ship if the lighthouse is known to be 50 meters above sea level.- A. 0.265 m/sec
^{} - B. 0.155 m/sec
- C. 0.169 m/sec
- D. 0.210 m/sec

#### Problem Answer:

The speed of the ship is **0.169 m/sec**.

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