JEE Math Practice Question
The angle of elevation of a jet plane from a point A on the ground is 60$$^\circ$$. After a flight of 20 seconds at the speed of 432 km/hour, the angle of elevation changes to 30$$^\circ$$. If the jet plane is flying at a constant height, then its height is :
- A.$$3600\sqrt 3 $$ m
- B.$$1200\sqrt 3 $$ m
- C.$$1800\sqrt 3 $$ m
- D.$$2400\sqrt 3 $$ m
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