Hello
To solve this question, we should understand we just have to find the difference in time between the two scenarios
The difference in time between 10 - 15 minutes is
[tex]15-10=5[/tex]The difference in time between 11 - 12 minutes is
[tex]12-11=1[/tex]The probability here would be
[tex]\frac{1}{5}=0.2=20\text{ \%}[/tex]The probability here is equal to 1/5 or 0.2 or 20%