To find out how many miles a whale swims in 16 days based on the information that it swims 200 miles in 5 days, we first need to determine the rate of swimming per day.
The rate of swimming per day is calculated as follows:
\[ \text{Rate} = \frac{200 \text{ miles}}{5 \text{ days}} = 40 \text{ miles per day} \]
Now, to find out how far the whale swims in 16 days, we can multiply the daily rate by the number of days:
\[ \text{Distance in 16 days} = 40 \text{ miles/day} \times 16 \text{ days} = 640 \text{ miles} \]
Thus, the equation we could use to represent this situation is:
\[ y = 40 \times 16 \]
So the correct response is:
y = 40×16
y equals 40 times 16