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The angle of the elevation of an aeropla...

The angle of the elevation of an aeroplane from a point on the ground is `45^(@)`. After flying for 15 seconds, the elevation changes to `30^(@)` . If the aeroplane is flying at a height of `2500` metres. Find the speed of the aeroplane.

A

440 kmph

B

400 kmph

C

360 kmph

D

480 kmph

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The correct Answer is:
A
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LUCENT PUBLICATION-HEIGHT AND DISTANCE-EXERCISE-12A
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  14. The angle of elevation of the top of an unfinished tower at a distance...

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  16. From a lighthouse the angles of depression of two ships on opposite si...

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  17. An aeroplane is vertically above the another plane flying at a height ...

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  18. A man stands at the end point of the shadow of a pole. He measure that...

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  19. The angle of depression of vertices of a regular hexagon lying in a pl...

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