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A moving boat is observed from the top o...

A moving boat is observed from the top of a 150 m high cliff moving away from it. The angle of depressioin of the boat changes from `60^@` to `45^@` in 2 minutes. Find the speed of the boat in 'm' min.

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AGRAWAL PUBLICATION-INTRODUCTION TO TRIGNOMETRY AND ITS APPLICATIONS-EXAMPLE
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