Answer:
12.5 or less
Explanation:
Let x b the number of miles Sharon travels, we can write an expression relating the amount she spends. We can add the cab flat fee and the amount per mile. So there:

So let that total cost per mile be less than equal to the amount the Sharon can spend:
2x≤25
We can determine x:
x≤12.5
Sharon can travel 12.5 or less