An aeroplane is flying horizontally at a height of 1.8 km ab

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SSC CGL Tier-2 9-March-2018 Maths-shift-1
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57

M: +3.00/-0.00

An aeroplane is flying horizontally at a height of 1.8 km above the ground. The angle of elevation of plane from point X is 60° and after 20 seconds, its angle of elevation from X is become 30°. If point X is on ground, then what is the speed (in km/hr) of aeroplane?

[SSC CGL Tier-2 9-March-2018 Maths-shift-1]

A 216√3

B 105√3

C 201√3

D 305√3