An aeroplane flying horizontally a height of 2500 m above the ground is observed an elevation of - 60 - circ - If after 15 seconds- the angles of elevation is observed to be - 30 - circ -find the speed of the aeroplane in km per hour-

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An aeroplane flying horizontally at a height of 2500 m above the ground is observed at an elevation of 60∘. If after 15 seconds, the angles of elevation is observed to be 30∘,find the speed of the aeroplane in km per hour.

An aeroplane flying horizontally at a height of 2500 m above the ground is observed at an elevation of $60^{\circ} .$ If after 15 seconds, the angles of elevation is observed to be $30^{\circ},$ find the speed of the aeroplane in km per hour.