SOLUTION: An airplane with a speed of 120 knots is headed west while a 30-knot wind is blowing from 120�. Find the ground speed to the nearest knot. 131 knots 141 knots 147 knots 164

Question 1054421:
An airplane with a speed of 120 knots is headed west while a 30-knot wind is blowing from 120�. Find the ground speed to the nearest knot.
131 knots
141 knots
147 knots
164 knots
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
I'm assuming that west is 180�.
Coming in from 120� means that the wind has an angle of 300�.
V+W=(-120,0)+(30cos(300),30sin(300))
V+W=(-120,0)+(15,-25.98)
V+W=(-105, -25.98)
So then the resultant,

.
.
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OK, looks like the assumption is not correct.
Please let me know what angle west is in your example.

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