A moving boat is observed from the top of a cliff of 150 m height. The angle of depression of the boat changes from 60° to 45° in 2 minutes, what is the speed of the boat in metres per hour?

• A. \(\frac{{4500}}{{\sqrt 3 }}\)
• B. \(\frac{{4500\left( {\sqrt 3 - 1} \right)}}{{\sqrt 3 }}\)
• C. 4500√3
• D. \(\frac{{4500\left( {\sqrt 3 + 1} \right)}}{{\sqrt 3 }}\)