Final answer:
Janelle has run 3/5 of a mile on the track, which is calculated by multiplying 3/4 (length of the track) by 4/5 (portion of the track run).
Step-by-step explanation:
Janelle is running on a track that is 3/4 of a mile long. She has run 4/5 of the way around the whole track. To find out how far she has run, we need to multiply these two fractions together:
(3/4) mile × (4/5) = (3×4)/(4×5) = 12/20
When we simplify 12/20, we get:
Therefore, Janelle has run 3/5 of a mile.