To find the rate at which the bus is traveling, we can use the distances and the times provided.
Looking at the data:
- At 0 hours, the bus has traveled 0 miles.
- After 1 hour, it traveled 30 miles.
- After 2 hours, it traveled 90 miles.
- After 4 hours, it traveled 240 miles.
The most clear data point to calculate the average speed over the entire journey is between hours 0 and 4, where it traveled 240 miles.
To find the speed, we use the formula:
\[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} \]
For the entire trip from 0 to 4 hours:
\[ \text{Speed} = \frac{240 \text{ miles}}{4 \text{ hours}} = 60 \text{ mph} \]
Thus, the rate at which the bus is traveling is 60 mph.