VTMO 2017 — Grade 3 — semifinal Question 6

Question 6

Pi has four rectangular pieces of wood, each $5 \,\mathrm{cm} \times 10 \,\mathrm{cm}$, and joins them to form a larger rectangle. What is the greatest possible perimeter?

$60 \,\mathrm{cm}$
$90 \,\mathrm{cm}$
$100 \,\mathrm{cm}$
$120 \,\mathrm{cm}$
Another answer.