The cities of Coco da Selva and Quixajuba are connected by a bus line. Buses leave Coco da Selva for Quixajuba every hour, with the first one departing at midnight on the dot. Buses leave Quixajuba for Coco da Selva every hour, with the first one departing at half past midnight. The bus journey takes exactly 5 hours.

If a bus leaves Coco da Selva at noon, how many buses coming from Quixajuba does it encounter during the journey?

![](https://cdn.mathpix.com/cropped/2024_05_01_d889f7c81233a28648eeg-1.jpg?height=226&width=317&top_left_y=1643&top_left_x=1506)

Figure 21.2

![](https://cdn.mathpix.com/cropped/2024_05_01_d889f7c81233a28648eeg-1.jpg?height=249&width=305&top_left_y=1943&top_left_x=1521)

Figure 21.3

![](https://cdn.mathpix.com/cropped/2024_05_01_d889f7c81233a28648eeg-1.jpg?height=220&width=214&top_left_y=2260&top_left_x=1566)

Figure 21.4