Where does Misha and Janina meet in the book milkweed?

In the book "Milkweed" by Jerry Spinelli, Misha and Janina meet in the streets of Warsaw, Poland, during World War II. Misha, a young Jewish boy, encounters Janina while scavenging for food. Their friendship develops amidst the harsh realities of war, highlighting themes of survival and connection in a perilous environment.