Question 754104
Let the speed of the man be X.  At this speed, the total time he takes to travel 108km is 108/X.

If he had travelled 2km/hour faster, his speed would have been X+2 km/hour. At this speed, he could have arrived at the destination 4.5 hours earlier. This means that the time taken to travel would have been 108/x -4.5 hours if his speed had been (X+2) km/hour.

So, according to the question, we have:

108/X - 4.5 = 108/ (X+2)   ----------- (1)

Solving this equation, we get X = 6 or -4.  So, his speed is 6km/hour.