1.

An aeroplane flying at a constant speed, parallel to the horizontal ground, sqrt(3) km above it, is observed at an elevation of 60^(@) from a point on the ground. If, after five seconds, its elevation from the same point, is 30^(@), then the speed (in km/h) of the aeroplane, is

Answer»

750
1440
1500
720

Answer :B


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