Book Maths Puzzle Numerical Ability

the angle of elevation of a cloud from a point 60 m above a lake is 30 degree and the angle of depression of the reflection of cloud in the lake is 60 degree. find the height of the cloud

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the value of 2sin^2 45+2cos^2 45+2sec^2 60 is the angle of elevation of a plane from a point on the ground is 60 degree. After 15 seconds it becomes 30 degree. If the plane is at height of 3000 m find the speed of the plane