An aircraft has airspeed of 300km/h and it's course is 020°. The speed of the wind is 80km/h blowing from 320°..sketch the diagram to represent this information (ie: the triangle of velocities).

Answer 1

Velocities are vectors, so they can be added and subtracted similar to displacements in the previous problem.
What is important is that to draw the triangle of velocities is to join the head of the first vector to the tail of the next vector.
The resultant is the vector obtained by joining the tail of the first vector to the head of the second vector.

Following link gives a complete description on the subject.
http://www.physicsclassroom.com/class/vectors/Lesson-1/Vector-Addition

Remember, you need to understand the subject before attempting problems, otherwise you would need help for each and every problem presented to you.