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[" (i) A moving boat is observed from th...

[" (i) A moving boat is observed from the top of "150mhigh" cliff moving awa "],[" cliff.The angle of depression of the boat changes from "60^(@)" to "45^(@)" in "2" minute "],[" speed of the boat in "m/h" ."],[" (ii) A man in a boat rowing away from a light house "100m" high takes "2],[" change the angle of elevation of the top of the light house from "60^(@)" to "30],[" speed of the boat in metres per minute.(Use "sqrt(3)=1.732" ) "]

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