[racket] Manipulation in World teachpack

Where do I use the place-image option to place the myself, shark, food1,
food2 images at required positions? Do I give that in the initial-world?

The define-struct has to be exactly as you showed right? Or do I have to
give the positions by using the make-posn there?

I am a total amateur to Racket. I hope you understand my lack of knowledge.
Sorry for the inconvenience.
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