A logistics coordinator analyzed 300 shipping routes for efficiency delays caused by three factors: severe weather, port congestion, and customs backlog. Analysis showed that 140 routes were delayed by weather, 120 by port congestion, and 110 by customs backlog. Furthermore, 50 routes suffered from both weather and congestion, 40 from both congestion and customs, and 60 from both weather and customs. If 30 routes were affected by all three factors