Hope this helps ---------
You and your friend made 13 each
It’s Negative below the lines the touching points do not meet
I hope this helps you
9x-2=12
9x=14
x=14/9
x= 1,555555
1 <1,5555 <2
B
4mins---->12 cars
6mins---->(6*12/4)=18
4mins---->12
5mins---->(5*12/4)=15
And so on