To find out how many miles the whale swims in 16 days, we first need to determine the rate at which the whale swims. The whale swims 200 miles in 5 days, which gives us a rate of:
\[ \text{Rate} = \frac{200 \text{ miles}}{5 \text{ days}} = 40 \text{ miles per day} \]
Now, to find out how far it swims in 16 days, we can use the rate we calculated:
\[ \text{Distance in 16 days} = \text{Rate} \times \text{Time} = 40 \text{ miles per day} \times 16 \text{ days} \]
Thus, the appropriate equation to find how many miles the whale swims in 16 days is:
\[ y = 40 \times 16 \]
The correct response from the given options is:
y = 40 × 16