Surely all the airline interviewer wanted to hear was something along the lines of:
"An airport has a runway at the end of which is a clearway and a/c must reach their screen height at the end of the clearway. Some of the clearway includes a stopway, which is purely there to support an a/c after a rejected take-off.
The maximum distance from the far end of the runway to the end of the clearway is never to be more than 150% of the actual runway length; however, if only the stopway is considered rather than all the clearway, the distance available to meet screen height is equal to the distance available from starting the take-off to stopping if the take-off has to be rejected. Such a case, where ASDA=TODA, is referred to as a 'balanced field'."
KISS!