An aeroplane flying at a height of 300 m above the ground passes vertically above another plane at an instant when the angles of elevation of the two planes from the same point on the ground are 60° and 45° respectively. What is the height of the lower plane from the ground?

• A. 100√3 m
• B. 100/√3 m
• C. 50√3 m
• D. 150(√3 + 1) m