Answer:
20.25 minutes.
Step-by-step explanation:
We have been given that Andres completed a 5-km race in 13.5 minutes. His sister’s time was 1 and 1/2 times longer than his time.
To find time taken by Andres's sister, we will multiply 13.5 by 1 and 1/2.
[tex]\text{time taken by Andres's sister}=1\frac{1}{2}\times 13.5\text{ min}[/tex]
[tex]\text{time taken by Andres's sister}=\frac{3}{2}\times 13.5\text{ min}[/tex]
[tex]\text{time taken by Andres's sister}=1.5\times 13.5\text{ min}[/tex]
[tex]\text{time taken by Andres's sister}=20.25\text{ min}[/tex]
Therefore, it will take Andres's sister 20.25 minutes to run the race.
