>>5250517You deduce that the monkey, tree, and bananas can all be transferred to the left bank if both sides are in a stable state. That is, when the dinghy takes off, no interactions are triggered: pigs can't eat cabbages, chicks can't eat seed, etc.
The river is <span class="mu-i">not</span> currently stable. Once the dinghy sets sail, interactions will occur. But if you ignore all other animals, you can solve the banana problem right now.