Answer: 2.5 or 2 1/2
Explanation:
You can convert the mixed fractions to decimal numbers:
- Divide the numerator by the denominator of the fraction.
- Add the result to the whole number.
Thenyou have:
Barbara's time:
![3\ 3/10=3+0.3=3.3](https://img.qammunity.org/2020/formulas/mathematics/high-school/y7w0ky03zeh6yc3m52kavtwt4pubmvfaqk.png)
Donna's time:
![2\ 4/5=2+0.8=2.8](https://img.qammunity.org/2020/formulas/mathematics/high-school/tmfehjzt2q9sqlcugt8evnoz78a3u27nnw.png)
Cindy's time:
![4\ 3/5=4+0.6=4.6](https://img.qammunity.org/2020/formulas/mathematics/high-school/6nu1rdxenj2mtxd93k9w5iptad0r45cdyn.png)
Nicole's time:
![2\ 1/10=2+0.1=2.1](https://img.qammunity.org/2020/formulas/mathematics/high-school/64joxqxjc7jpf94xamjf51o69y8nlthast.png)
As you can see, the fastest girl is Cindy and the slowest girl is Nicole.
Then, you must make the following subtraction to calculate the difference:
or 2 1/2