Answer
Ratio of Orca whale’s length to whale shark’s length = $\frac{3}{4}$
Work Step by Step
We need to find the Ratio of Orca whale’s length to whale shark’s length.
i.e. $\frac{Orca whale’s length}{whale shark’s length}$
= $\frac{30 ft}{40 ft}$
= $\frac{30}{40}$ (As units were same in numerator and denominator)
= $\frac{30\div10}{40\div10}$
= $\frac{3}{4}$