The top of a hill when observed from the top and bottom of a building of height h is at angles of elevation p and q respectively. What is the height of that hill?

• A. \(\frac{{h\cot q}}{{\cot q - \cot p}}\)
• B. \(\frac{{h\cot p}}{{\cot p - \cot q}}\)
• C. \(\frac{{2h\tan p}}{{\tan p - \tan q}}\)
• D. \(\frac{{2h\tan q\;}}{{\tan q - \tan p}}\)