her time from start to finish the number of steps she took her heart rate at the finish line the direction she began running
I gave my students this multiple choice question: Marni runs 1500 meters around the school track. What does she need to know in order to find out her speed?

Only one answer is correct among these 4 choices:
- her time from start to finish
- the number of steps she took
- her heart rate at the finish line
- the direction she began running

Could you tell me which one is correct?

her time from start to finish