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The pilot of an eastbound plane determines wind speed relative to his aircraft. He measures a wind velocity of 320 km/h, with the wind coming from the east. An observer on the ground sees the plane pass overhead, and measures its velocity as 290 km/h. What is the wind velocity relative to the observer?

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The pilot of an eastbound plane determines wind speed relative to his aircraft. He measures a wind velocity of 320 km/h, with the wind coming from the east. An observer on the ground sees the plane pass overhead, and measures its velocity as 290 km/h. What is the wind velocity relative to the observer?






 
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