Question

A man on a cliff observes a boat at an angle of depression 30 degree,which is sailing toward the point of the shor immediately beneath him.three minutes later the angle of depression of the boat is found to be 60 degree.assuming that the boat sails at a uniform speed,determine how much more time it will take to reach the shore.

Answer 1

Let height of cliff that is AB be h
Speed be x
Time from D to B be y

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