Final answer:
Ski Run B is steeper.
Step-by-step explanation:
To determine which ski run is steeper, we need to compare the ratios of vertical distance to horizontal distance for each run.
For Ski Run A, the vertical distance is 30 yards and the horizontal distance is 800 yards. So, the ratio is 30/800 = 0.0375.
For Ski Run B, the vertical distance is 40 yards and the horizontal distance is 400 yards. So, the ratio is 40/400 = 0.1.
Comparing the ratios, we can see that the ratio for Ski Run B (0.1) is greater than the ratio for Ski Run A (0.0375). Therefore, Ski Run B is steeper.