Answer: Last option is correct.
Step-by-step explanation:
Since we have given that
Length of a blue whale is given by
[tex]3\times 10^4[/tex]
Length of an otter is given by
[tex]2\times 10^3[/tex]
Number of times the blue whale is longer than the otter is given by
[tex]\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[/tex]
Hence, Last option is correct.
