Question 1160583
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The formulation of the problem is not self-consistent.


If it requests for ESTIMATION, it should ask which of the four values/options is closest.


Let the number of cars be N, an unknown value.


Then there are (N-1) gaps between the cars, and the basic equation is


    0.7*N*13.5 + 0.3*N*20 + 3*(N-1) = 4*5280


which gives


    N = {{{(4*5280 + 3)/(0.7*13.5 + 0.3*20 + 3)}}} = 1144.9 = 1145 (rounded to the closest integer)


Of the given options, the closest is  1172, option C).
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Solved.