VTMO 2014 — Grade 7 — semifinal Question 17

Cutting $a = 72 \,\mathrm{cm}$ rod into $6 \,\mathrm{cm}$ pieces takes $165$ minutes. At the same cutting rate, how long to cut $a = 144 \,\mathrm{cm}$ rod into $6 \,\mathrm{cm}$ pieces?