﻿
Question
Sat February 11, 2012

# A bird was flying in a line parallel to ground from north to south at a height of 200m.Tom standing in the middle of the field first he observed bird in north at an angle of 30degrees.After 3 minutes he observed it in south at an angle of 45degrees.Find speed of bird in km/hr(root3=1.73)

Sat February 11, 2012
Let x be the distance covered by the bird to the left of boy
So 200/x = tan30 =1/root3
x = 200root3
Similarly let y be the distance travelled by the bird in the right of the boy
200/y = tan45 =1 , y =200
Speed  = (x+y)/180 = 200(root3 + 1)/1800 = (root(3) + 1)/9 = 2.73/9 = 0.303 m/s
Related Questions
Sun September 11, 2016

# The tallest tower in a city 100mt high and a multistoryed hotel at the city center is 20mt high. The angle of elevation of the top of the tower of the hotel is 3°36' . A building H meter high is situated on the road connecting the tower with city center at a distance of 1Km from the tower. Find the value of H .if the top of the hotel, top of the building and top of the tower in a straight line .Also find distance of the tower from the city center?

Tue February 23, 2016

﻿