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30. A man observes a car from the top of a tower, whichis moving towards the tower with a uniform speed.If the angle of depression of the car changes from30° to 45° in 12 minutes, find the time taken by thecar now to reach the towerSolution : Let AB is a tower, car is at point D at 30°and goes to C at 459 in 12 minutes.Sol45 A3030°45BV |
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