I saw the image. The large box is filled with 6 columns of staples which has 5 box of staple each.
6colums * 5boxes/column = 30 boxes of staples.
30 boxes * 120 cu cm/box= 3,600 cu cm.
The estimated volume of the large box is 3,600 cu cm.
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>

The answer is D). 125 = 1.28f. This accounts for both sales tax and the cost of food.