Teacher:In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
Teacher: Now, understand the problem? Solve this instance: Race length can be either a time or a number of laps .
Student:
Race length can be determined by a number of laps or total time , in which case the number of remaining laps is calculated as the race progresses .