I have a question regarding the Delta job knowledge test. Sheppard Air provides a gouge on their web site that give some sample question from the Delta knowledge test used by DCI carriers in the interview process. One of the questions is this:

"You are on the XYZ VOR 090° radial at 20 DME. You are instructed to proceed
direct to the XYZ VOR 180° radial at 70 DME. The direct, no wind heading is"

How is this supposed to be calculated?