A hydrogen filled balloon ascending at the rate of 18 kmph was drifted by wind. Its angle of elevation at 10th and 15th minutes were found to be 60° and 45° respectively. The wind speed (in whole numbers) during the last five minutes, approximately, is equal to
A) 7 km/hr B) 11 km/ hr C) 26 km/hr. D) 33 km/hr
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Option D ) 33 km/hr
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