1.

An aeroplane is moving at a constant altitude 'h'. At 10:00 AM, it is seen at an elevation of 30°. 1 minute later, it is observed at an elevation of 60°. If the speed of the plane is 960 km/h, then find 'h'.

A. 13.86 km
B. 15 km
C. 12.46 km
D. 20 km
Answer» B. 15 km


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