A plane is flying towards the airport and pilot on plane makes an angle of 30° to a point at the airport. After travelling for 20√3 seconds, angles changes to ‘θ’ and speed of plane is 1200 feet/s. If vertical height of plane from the ground is 36000 feet, then what is the value of ‘θ’?
1
90°
2
30°
3
60°
4
45°