Solve this:
1) The angle of elevation of a cloud from a point 60m above a lake is 30o and the angle of depression of the reflection of the cloud in the lake is 60o. Find the height of the cloud from the surface of the lake.
2) The angle of elevation of a jet fighter from a point A on the ground is 60o, After a flight of 10 seconds, the angle of elevation changes to 30o. If the jet is flying at a speed of 432 km/hr, find the constant height at which the jet is flying.

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