Answer
$\frac{v_s}{v_{ns}} = 3.5$
Work Step by Step
Let $x$ be the distance of the path.
We can write an expression for the speed $v_s$:
$v_s = \frac{x}{7.1}$
We can write an expression for the speed $v_{ns}$:
$v_{ns} = \frac{x}{25.0}$
We can find the ratio of $v_s$ to $v_{ns}$:
$\frac{v_s}{v_{ns}} = \frac{\frac{x}{7.1}}{\frac{x}{25.0}}$
$\frac{v_s}{v_{ns}} = \frac{25.0}{7.1}$
$\frac{v_s}{v_{ns}} = 3.5$
