Correct Answer:
D) \( \Large 30 \left(\sqrt{3} + 1\right) m \) |
Description for Correct answer:
Let the height of the tower be h.
=> \( \Large h = \frac{60}{\sqrt{3}-1} = \frac{60 \left(\sqrt{3}+1\right) }{2} = 30 \left(\sqrt{3}+1\right) m \)
Part of solved Height and Distance questions and answers : >> Elementary Mathematics >> Height and Distance
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11.
An aeroplane flying horizontally at a height of 3 Km, above the ground is observed at a certain point on earth to subtend an angle of 60°. After 15 sec flight, its angle of elevation is changed to 30°. The speed of the aeroplane (taking √3 = 1.732) is
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230.63 m/sec
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230.93 m/sec
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235.85 m/sec
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235.85 m/sec
B.
230.93 m/sec