Concept:Speed: The distance travelled by the body in unit time.\(Speed = \frac{{Distance}}{{Time}}\)Also, \(Time= \frac{{Distance}}{{Speed}}\)Average Speed: Since the body does not always have the same speed, So we use the concept of average speed. It is the ratio of total distance covered to total time taken by the body.\(Average\;Speed = \frac{{Total\;Distance}}{{Total\;Time}}\)Calculation:StationDateArrivalDepartureNagarcoil4th June 20-22:30Madgaon6th June, 2004:30- Total distance = 1145 kmTotal time taken = 1.5 hr + 24 hr + 4.5 hr = 30 hrWe know that,\(Average\;Speed = \frac{{Total\;Distance}}{{Total\;Time}}\)\(? Average\;Speed = \frac{{1145\;km}}{{30\;hr}}\)? Average Speed = 38.16 km/hrThe average speed of the train was nearly 38.5 km/hr