Let
x--------> the time in hours
y-------> the distance in miles
we know that
The speed is equal to

in this problem


<u>Equation First Train</u>

<u>Equation Second Train</u>

---------> equation 
Substitute the values of
and
in the equation 

Solve for x


therefore
<u>the answer is</u>

Answer:
9 cars/week
Step-by-step explanation:
(10+9+11+6)/4=36/4=9
Slope formula is y2-y1/x2-x1.
Using this, we can say that -3 – 2/5 – 0=
1.
1/10 * 4/10 = 4/100 divide both by 4 it'll be 1/25