A car travels 150 miles at an average speed of 50 mph. It then travels another 100 miles at 40 mph. What is the average speed for the entire trip?

Sat, 18 Apr 2026 16:33:26 +0000

**What Drives Interest in Speed Calculation: The Classic 150-100 Mile Trip Mystery** Have you ever stopped to think about how average speed is calculated when a car travels 150 miles at 50 miles per hour, then heads another 100 miles at 40 mph? That simple question—*What is the average speed for the entire trip?*—sparks curiosity among drivers and casual travelers alike. In an era where data-driven decisions shape daily life, even basic physics problems are increasingly relevant. With rising fuel costs, shifting commute patterns, and growing interest in efficient travel, understanding speed and time metrics feels more important than ever. People are naturally curious about how to calculate total journeys beyond simple addition—especially when speed changes. This equation reveals more than numbers; it reflects real-life driving choices, time management, and planning efficiency. Let’s unpack this puzzle step by step. Why does mixing speeds create confusion? Because our brains often default to averaging numbers directly—say, (50 + 40)/2 = 45—but that fails when distances differ. The true average speed depends on total distance divided by total time, not a simple arithmetic mean. Understanding this distinction helps navigate not only travel math but also everyday planning. ### Why This Problem Is Gaining Momentum in the US