Question

10. A moving boat observed from the top of a 150 m
high cliff, moving away from the cliff. The angle
of depression of the boat changes from 60° to 45° in
2 minutes. Find the speed of the boat.​

Answer 1

Step-by-step explanation:

tan60°=150/x1

x1=150/√3=50√3

tan45°=150/x2

x2=150

distance covered in 2 min=150-50√3

speed of boat=50(3-√3)/120

=5/12 (3-√3)m/sec