When the sun is 30 above the horizon, shadow of one tree is 17-3 m long. What is the height of this tree ?

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Q: 55 (NDA-I/2015)
When the sun is 30° above the horizon, shadow of one tree is 17-3 m long. What is the height of this tree ?
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question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,3,5,3,2,3,0

keywords: 

{'height': [0, 0, 1, 2], 'tree': [3, 0, 1, 1], 'sun': [3, 0, 0, 6], 'horizon': [0, 0, 1, 5], 'shadow': [2, 1, 0, 1]}