JEE Main 2021 Mathematics question

The angle of elevation of a jet plane from a point A on the ground is 60°. After a flight of 20 seconds at the speed of 432 km/hour, the angle of elevation changes to 30°. If the jet plane is flying at a constant height, then its height is :

• (A) m
• (B) m
• (C) m
• (D) mCorrect