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A man in a rowing away from light house 100 m high takes 2 minutes to changes the angle of elevation of the top of light house from 60 degree to 45 degree find the speed of the boat?
Wiki User
∙ 10y ago
At the start his distance from the lighthouse is 100/tan(60) = 86.6 m.
After 2 minutes his distance from the lighthouse is 100/tan(45) = 70.7 m.
He travels 15.9 m in 2 minutes = 7.9 m per minute.
Wiki User
∙ 10y ago
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