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QUESTION
As a hot-air balloon rises vertically, its angle of elevation from a point P on level ground d = 160 kilometers from the point Q directly underneath
As a hot-air balloon rises vertically, its angle of elevation from a point P on level ground d = 160 kilometers from the point Q directly underneath the balloon changes from 17°30' to 30°30' (see the figure). Approximately how far does the balloon rise during this period? (Give the answer to one decimal place.)
