Interpreting the Inverse of a Tabular Function

A function $f\left(t\right)$ is given in the table, showing distance in miles that a car has traveled in $t$ minutes. Find and interpret $f^{-1}\left(70\right).$

$$\begin{array}{ccccc}t(\text{minutes})& \text{30}& \text{50}& \text{70}& \text{90}\\ f\left(t\right)(\text{miles})& \text{20}& \text{40}& \text{60}& \text{70}\end{array}$$

OpenStax, Algebra and Trigonometry 2e · §3.7 Inverse Functions · Example 6