To solve the problem, we need to ensure that the units for distance and velocity are compatible. The ladybug's speed is given in inches per second, while the distance to be covered is given in feet.
Since there are 12 inches in a foot, we need to convert the distance from feet to inches. The distance of 10 feet is equivalent to:
\[ 10 \text{ feet} \times 12 \text{ inches/foot} = 120 \text{ inches} \]
Thus, using inches for both distance and velocity is the most sensible unit conversion to apply here.
So, the unit conversion that makes the most sense is converting feet to inches.