The top of a 15 metre high tower makes an angle of elevation of 60° with the bottom of an electric pole and… · ABC26GN5442
Subject: General Aptitude · Chapter: Heights and Distances · Exam: R.R.B. 2009
The top of a 15 metre high tower makes an angle of elevation of 60° with the bottom of an electric pole and angle of elevation of 30° with the top of the pole. What is the height of the electric pole?
(a)5 metres
(b)8 metres
(c)10 metres
(d)12 metres
(e)None of these
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
Horizontal distance = 15/tan 60° = 5√3 m; from the tower top the pole top is 5√3 × tan 30° = 5 m below, so the pole is 15 − 5 = 10 m.