Answer:
Part a: 4 minutes
Part b: [tex]\frac{1}{4}[/tex] lap
Part c: 84 minutes or 1 hr and 24 minutes
Step-by-step explanation:
Part a:
Ok so you got part a right, it's 4 minutes.
Part b:
you would do [tex]\frac{2laps}{8min.}[/tex] that will give you [tex]\frac{1}{4}[/tex].
So it's a quarter of a lap per minute.
Part c:
For this one we know that it takes her 4 minutes just to complete one lap, and if they're doing 21 laps that means we'll multiply 21 and 4. That gives us 84 minutes, or 1 hr and 24 min.