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A hydrogen filled balloon ascending at t...

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 num- bers) 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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