A teacher sends her students on a treasure hunt

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A teacher sends her students on a treasure hunt. She gives the following instructions:

1. Walk 300 m north
2. Walk 400 m northwest
3. Walk 700 m east-southeast and the treasure is buried there.

As all the other students walk off following the instructions, Joe physics student quickly adds the displacements and walks in a straight line to find the treasure. How far and in what direction does Joe need to walk?

A) 399 m in a direction 52.5° north of east
B) 187 m in a direction 67.3° north of east
C) 284 m in a direction 28.2° west of north
D) 481 m in a direction 40.9° north of east
E) The treasure position cannot be reached in one straight walk.