Question

This qusetion was about a journey between two towns. During the start of the journey the odometer reads 39593 ( the reverse of the no is also the same) and at the end of the journey again the odometer reads a number similar to prior one....If the max speed is 90km/hr during the journey. what will be the avg speed thruout the journey?
Steve
since there's no information about the time involved, it's tough to figure the speed.