A person was jogging at a uniform speed on a road at a speed of 18kmph when he

A person was jogging at a uniform speed on a road at a speed of 18kmph when he saw an aeroplane and started running towards it. Aeroplane was also flying at a uniform speed at a height of 3 km and person was looking at the aeroplane at an angle of elevation 60°. After 3 seconds angle of elevation was found to be 30°. What is the speed of the aeroplane

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