26. A moving boat is observed from the top of a 150 m high cliff moving away from the cliff. The angle of depression of the boat changes from 60o to 45o​ in 2 minutes. Find the speed of the boat in m/h.

Hi, 
Refer the link:
https://www.meritnation.com/ask-answer/question/a-man-in-a-boat-rowing-away-from-a-lighthouse-150m-high-take/academics/3560005

You may change at the end m/s to m/h by multiplying the result to 3600

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