Time taken to reach Tamara
[tex]=10x-3[/tex]
Time taken to reach Northvile
[tex]=5x+7[/tex]
Difference in time
Time taken to reach Tamara minus time taken to reach Northvile
[tex]=10x-3-(5x+7)[/tex]
We expand brackets to obtain,
[tex]=10x-3-5x-7[/tex]
Regroup like terms on the right side of the equation to get;
[tex]=10x-5x-3-7[/tex]
We simplify to obtain,
[tex]=5x-10[/tex]
Hence the difference in length of travel time is [tex]5x-10[/tex] minutes.