Answer:
7 minutes 10 seconds.
Step-by-step explanation:
Donya ran a 3 k race at a constant speed = 21 minutes 30 seconds
1 minutes = 60 seconds
21 minutes 30 seconds = 21 + (30/60) = 21.5 minutes
At this speed it would take her to run 1 k race [tex]=\frac{21.5}{3}[/tex]
= 7.17 minutes
7.17 minutes = 7 + (0.17 × 60) = 7 minutes 10 seconds
At this speed it takes her 7 minutes 10 seconds to run 1 k race.
