Answer: Last option is correct.
Step-by-step explanation:
Since we have given that
Length of a blue whale is given by
\(3\times 10^4\)
Length of an otter is given by
\(2\times 10^3\)
Number of times the blue whale is longer than the otter is given by
\(\frac{\text{Length of a blue whale}}{\text{ Length of an otter}}\\\\=\frac{3\times 10^4}{2\times 10^3}\\\\=\frac{3\times 10000}{2\times 1000}\\\\=\frac{30}{2}\\\\=15\ millimeters\)
Hence, Last option is correct.
