The angle of elevation of an aeroplane from a point on the ground is 45Â°. After flying for 15 seconds, the elevation changes to 30Â°. If the aeroplane isÂ flying at a height of 2500 metres, then the speed of the aeroplane in km/hr. is

The angle of elevation of an aeroplane from a point on the ground is 4

1.	The angle of elevation of an aeroplane from a point on the ground is 45Â°. After flying for 15 seconds, the elevation changes to 30Â°. If the aeroplane isÂ flying at a height of 2500 metres, then the speed of the aeroplane in km/hr. is
A.	600
B.	600 (âˆš3 + 1)
C.	600 âˆš3
D.	600 (âˆš3 - 1)
Answer» E.

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The angle of elevation of an aeroplane from a point on the ground is 45Â°. After flying for 15 seconds, the elevation changes to 30Â°. If the aeroplane isÂ flying at a height of 2500 metres, then the speed of the aeroplane in km/hr. is

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