A moving boat is observed from the top of a cliff of 150 m height. The angle of depression of the boat changes from 60^ to 45^ in 2 minutes. What is the speed of the boat in metres per hour?

NDA 2016 Mathematics question

A moving boat is observed from the top of a cliff of 150 m height. The angle of depression of the boat changes from to in 2 minutes. What is the speed of the boat in metres per hour?

(A)
(B)Correct
(C)
(D)

Answer: (B)

Solution

Horizontal distances from the foot of the cliff: m and m. Distance covered in 2

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Question ID VK-028500