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# Determining speed and direction of an aircraft

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A. The pilot of an aircraft wishes to fly due west in a 50 km/h wind blowing towards the south. The speed of the aircraft, relative to the air is 100 km/h. In what direction should the aircraft head? (Answer in units of degrees from due East, with counterclockwise positive, within the limits of -180 degrees to +180 degrees).

B. What will be the speed relative to the ground? (in units km/h)

##### Solution Summary

The expert determines the speed and direct of an aircraft.

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Let's consider what information we know:

Velocity of wind: 50km/h [S]
Speed of plane: 100km/h (relative to air, which means that using the air space as our absolute reference, this is it's speed)
Direction of travel, in reference with land: West

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