A glider moving with a speed of 200 kilometers/hour experiences a cross wind of 30 kilometers/hour. What is the resultant speed of the glider relative to the ground?

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You didn't say so, but we must assume that the "200 km/hr" is the glider's air-speed, that is, speed relative to the air.  If the air itself is moving at 30 km/hr relative to the ground and across the glider's direction, then the glider's speed relative to the ground is                  √(200² + 30²)              =  √(40,000 + 900)              =  √(40,900)  =  202.24... km/hr   (rounded) 

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