A man in a boat moving away from a cliff 100 m high tak... – Trigonometry

Trigonometryhard · Past Paper

A man in a boat moving away from a cliff 100 m high takes 2 mins for elevation to change from 60 to 30. Speed?

A100/√3 m/min

B100√3 m/min

C50√3 m/min

D200/√3 m/min

✓ Correct Answer: A — 100/√3 m/min

d1 = 100/√3, d2 = 100√3. Distance = 100√3 - 100/√3 = 200/√3. Speed = (200/√3)/2 = 100/√3.

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