Question
The angle of elevation of the top of a building from a
point on the ground is 60°. After walking 20 meters towards the building, the angle of elevation becomes 75°. Find the initial distance from the point on the ground to the building.Solution
Let the height of the building be h meters, and the initial distance from the point on the ground to the building be d. From the first observation: tan(60°) = h/d, so h = d√3. From the second observation: tan(75°) = h/(d - 20). 2+√3= d√3/(d - 20)  d = 10(√3+2) meters. Correct option: c
More Quant Miscellaneous Questions
[√441 ÷7] × 40% of ? = 500 – 12.5% of 400
√2025 + √1024 - √1296 = 20% of ?
Find the value of 5342.5 +543.45+54.345 +5.4345+0.54345.
- What will come in the place of question mark (?) in the given expression?
(√1089 + 47) X 4.5 = ? - √256 X 10 63 × 4 = ?2 – 1620 ÷ 5
40% are the passing marks. A student gets 250 marks yet fails by 38 marks. What is the maximum marks?
∛857375 + ∛91125 = ? + √6889
- What will come in place of the question mark (?) in the following questions?
0.5×120+25=? √3598 × √(230 ) ÷ √102= ?
