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A plane travels at an airspeed (speed relative to the air) 160 km/h. A 70 km/h...

A plane travels at an airspeed (speed relative to the air) 160 km/h. A 70 km/h wind is blowing to the south. At what direction (in degrees, north of east) a pilot must head if he is going to fly to the east relative to the ground?

a) 15.6° b) 8.75° c) 11.2° d) 19.1° e) 25.9°

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