Hi there!
Your question asks of a whale's elevation after 6 seconds.
To find that, we must first find how much the whale descents per second. To do that we divide 382.5 feet on 45 seconds.
The answer to that will be 8.5 feet.
8.5 feet is how much a whale will descend per second. To see how much it will descend in 6 seconds, we multiply 8.5 on 6, and that will equal 51 feet.
Your answer is 51 feet.
Hope this helped!~
