Question

An aeroplane is flying parallel to the Earth’s surface at a speed of 175 m/sec and at a height of 600 m. The angle of elevation of the aeroplane from a point on the Earth’s surface is 37° at a given point. After what period of time does the angle of elevation increase to 53°? (tan 53° = 1.3270, tan 37° = 0.7536)

Answer 1

Let Plane’s initial position be A. Plane’s final position = D Plane travels from A ➝ D.

Equating (1) and (2)