Question:
Given that $a + b + c = 5$ and $1 \le a,$ $b,$ $c \le 2,$ find the minimum value of
\[\frac{1}{a + b} + \frac{1}{b + c}.\]

Answer:
By AM-HM,
\[\frac{(a + b) + (b + c)}{2} \ge \frac{2}{\frac{1}{a + b} + \frac{1}{b + c}},\]so
\[\frac{1}{a + b} + \frac{1}{b + c} \ge \frac{4}{a + 2b + c} = \frac{4}{b + 5}.\]Since $b \le 2,$ $\frac{4}{b + 5} \ge \frac{4}{7}.$  Equality occurs when $a = c = \frac{3}{2}$ and $b = 2,$ so the minimum value is $\boxed{\frac{4}{7}}.$