Answer :
(a) According to the question, the total distance travelled is 23 km and the total time taken is 28 minutes.
Time Taken (in hours) = 28/60 h
Average speed is given as follows :
Average Speed = Total distance / time taken = 23 / (28/60)
Average Speed = 49.29 km/h
(b) According to the question, the distance between the hotel and the station is 10 km, which is equal to the displacement of the car. Therefore,
Average velocity = 10 / (28/60)
Avg. Velocity = 21.43 km/h
Average speed and velocity are not equal to each other.