Respuesta :
A)
To find how many minutes per lap did Lin run, divide the amount of minutes over the amount of laps.
Since Lin ran six laps in nine minutes, then:
[tex]\frac{9\text{ minutes}}{6\text{ laps}}=1.5\text{ minutes per lap}[/tex]B)
To find how many laps per minutes is that, divide the amount of laps over the amount of minutes:
[tex]\frac{6\text{ laps}}{9\text{ minutes}}=0.666\ldots\text{ laps per minute}[/tex]C)
The amount of laps is given. Since it takes 1.5 minutes for Lin to run a single lap, multiply 21 times 1.5 to find the total amount of time that it takes for Lin to run 21 laps:
[tex]21\text{ laps}\times1.5\text{ minutes per lap}=31.5\text{ minutes}[/tex]