Final answer:
The average velocity of the bus is 90 km/h.
Step-by-step explanation:
To calculate the average velocity of the bus, we need to divide the total displacement by the total time taken.
The displacement of the bus is the difference between its positions at 2:15 pm and 3:09 pm: 116 km - 35 km = 81 km.
The total time taken is the difference between the two given times: 3:09 pm - 2:15 pm = 54 minutes = 0.9 hours.
Therefore, the average velocity of the bus is:
Average velocity = displacement / time = 81 km / 0.9 hours = 90 km/h