The rajdhani express travels from mumbai to delhi a distance of 1384 km . It starts from mumbai at 4:00 pm and reaches delhi at 9:00 am , the next day . What is the average speed?
Distance travelled = 1384 km
Time taken = 4 pm to 9 am = 17 hrs
Therefore, average speed = total distance/total time = 1384/17 = 81.41 km/h