A whale swims 200 miles in 5 days. Which equation can be used to find how many miles it swims in 16 days?

A. y = 200 x 16
B. y = 200/16
C. 200 = 16x
D. y = 200/5 x 16

The correct equation is D. y = 200/5 x 16. This equation represents the rate at which the whale swims in miles per day (200/5) multiplied by the number of days (16) to find the total number of miles it swims.