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Hello. My answer is in the spoiler below.
Tiffy takes Bubblegum across the Lemonade Lake and then she rows back to the beginning without any passenger..
Tiffy and Nutcracker join Bubblegum. Since Nutcracker and Bubblegum can't be left alone, Bubblegum acompanies Tiffy on her way back.
Tiffy transports apples across the Lake and returns to Bubblegum alone.
Tiffy and Bubblegum join Nutcracker and a basket of apples.
Poor Tiffy, she did so much rowing !