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Importance
Look at it this way. (x.y x = 10 / y = 1) So, 3 inches straight is 15 * 3 = 45, and the 0.4 would be 45 + 4 = 49. So, 49 should be your answer.

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[tex]\bf \begin{array}{ccll} \stackrel{inch}{map}&\stackrel{mile}{actual}\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ 1&15\\ 3.4&x \end{array}\implies \cfrac{1}{3.4}=\cfrac{15}{x}\implies x=\cfrac{3.4\cdot 15}{1}[/tex]

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