Question

a bird was flying in a line parallel to Ground from north to south at height of 2000 M long standing in middle of filled first observed the bird in North at angle 30° after 3 minutes he again observe it south at angle 45 degree find the speed of bird in kilometre per hour?
$\sqrt{3 = 1.73}$

Answer 1

Answer:109.20

Step-by-step explanation:a bird is flying to north at an angle of elevation of 30°.

Using tan 30°=opp/adj

=1/√3=2000/BC

BC=2000√3m-------------(1)

Now, the bird fly to south at an angle of elevation of 45°

= tan45°=opp/adj

=1=2000/CD

=CD=2000m----------------(2)

Therefore,distance=BC+CD

2000√3+2000 =2000(√3+1)m

But we want the answer in km

2000(√3+1)/1000 = 2(√3+1)km

Bird takes 3min=3/60hr

Therefore,speed=distance/time

=2(√3+1)/3/60

=2(√3+1)×60/3

=20(2√3+2)

=40√3+40. (√3=1.73)

=40×1.73+40

=69.20+40

=109.20km/hr

Answer 2

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