VTMO 2026 - Grade 9 - Semifinal - SET 08 - Self-study Question 11

Hạnh and Phúc must fold 24 gliders and 15 cranes. Hạnh takes 2 minutes per glider and 6 per crane; Phúc takes 3 per glider and 5 per crane. They work simultaneously. What is the minimum completion time in minutes?