Height and Distance: JEE Main 2018 Mathematics question

JEE Main 2018 · 15 Apr, Morning shift · Q3909

JEE Main 201815 Apr, Morning shiftMathematicsMediumHeight and Distance38× since 2004

An aeroplane flying at a constant speed, parallel to the horizontal ground,

\sqrt 3

kmabove it, is obsered at an elevation of

{60^o}

from a point on the ground. If, after five seconds, its elevation from the same point, is

{30^o}

, then the speed (in km / hr) of the aeroplane, is :

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