a moving boat is observed from the top of 250 m high cliff moving away from the cliff.The angle of depression of yhe boat changes from 60° to 45° in 2 mi. Find the speed of the boat in m/h
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Step-by-step explanation:
Let height be ab distance covered by boat be dc total distance bc.
Tan45=250/bc
Bd+dc=250
Tan60=250/bd
Bd=250/root3
Dc=250-250/root3
Dc=250(1-1/root3)
Speed=distance/time
=250(root3-1)/root3×30
=2500root3(root3-1) m/h
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