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## Homework Statement

A plane flies at 400 km/h [south 30 degrees east]. The wind is blowing from the east at 100 km/h. Find the resulting speed of the plane.

## Homework Equations

Not sure

## The Attempt at a Solution

I've drawn a diagram similar to this:

|\

| \

| \

|30\

| \

| \ 400 km/h

| \

|_____\

100km/h

I thought this was just a simple question of finding the left side of the triangle, but I don't seem to get the answer. Any hints is greatly appreciated.

Thank you in advance.

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