Canadian geese migrate essentially along a north-south direction for well over a

Question

Canadian geese migrate essentially along a north-south direction for well over a thousand kilometers in some cases, traveling at speeds up to about 100km/h. If one such bird is flying at 100 km/hrelative to the air, but there is a 38.0km/h wind blowing from west to east

At what angle relative to the north-south direction should this bird head so that it will be traveling directly southward relative to the ground?

How long will it take the bird to cover a ground distance of 400km from north to south? (Note: Even on cloudy nights, many birds can navigate using the earth's magnetic field to fix the north-south direction.)

Explanation / Answer

tan inverse(38/100) =20.8 degrees west of south

Need the resulting speed created from this triangle:
SQRT((38^2)+(100^2))=106.976 km/h

So, for 400 km:

400 km/ (106.976 km/h)=3.74 hours

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