Problem: 1. What is the average speed of the bus that travels 450 km in 5 hours? 2. Calculate the distance travelled by the driver with an average speed of 80 km/hr in 2 hours. 3. How many hours does it take to travel if the distance between two places is 180 km with an average speed of 90 km/hr? 4. Determine the acceleration of a vehicle if its velocity increases from 20 m/s north to 40 m/s north in 10 seconds.​