A hydrogen filled balloon ascending at the rate of 18 kmph was drifted – McqOptions

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1.	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 60Â° andÂ 45Â° 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
Answer» E.

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