The graph below represents the number of cars that can be cleaned over time at Sparkle Car Wash.

The title of the graph is, Cars Cleaned over Time. The horizontal axis is titled, Time in hours, and ranges from 0 to 6. The vertical axis is titled, Number of Cars, and ranges from 0 to 50.

How many cars can Sparkle Car Wash clean per hour?

Respond in the space provided.