Suppose,there are two windows in a house...

Suppose,there are two windows in a house.A window of the house is at a height of 1.5 m above the ground and the other window is 3 m vertically above the lower window.Anil and Sanjeev are sitting inside the two windows,At an instant the angles of elevation of two balloon from these windows are observed at `45^@` and `30^@`,respectively. 1. Find the height of the balloon from the ground. 2. Among sanjeev and anil,who is more closer to the balloon. 3. If balloon is moving towards the building, then will both the angle of elevation remain same?

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