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A lift in a building of height 90 feet w...

A lift in a building of height 90 feet with transparent glass walls is descending from the top of the building. At the top of the building, the angles of depression to a fountain in the garden is `60^(@)`. Two minutes later, the angle of depression reduces to `30^(@)`. If the fountain is `30sqrt(3)` feet from the entrace of the lift, find the speed of the lift, and the speed of the lift which is descending.

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