Question

An aeroplane flying horizontally 1 km above ground is observed at an elevation of 60° . After 10 seconds elevation is observed to be 30°. Find speed in km/h. Please answer in right manner.

Answer 1

Wait i skidded 1 step

So this is the correction

2/root3 covered in 10sec

Then in 1 sec =1/5 root 3 km /sec

Speed in km/hr

1/5 root 3 x 3600

=720/root3

=240 root3 km/hr

=415.69km/hr (Ans)

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