To find the rate at which the bus is traveling, we need to calculate the average speed using the distance traveled and the time taken.
From the table, we can see that the distance traveled from 0 hours to 4 hours is 240 miles. Therefore, we can calculate the speed as follows:
\[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} = \frac{240 \text{ miles}}{4 \text{ hours}} = 60 \text{ mph} \]
Thus, the rate at which the bus is traveling is 60 mph.