Solution:
The word problem , can be solved by unitary method:
Total time = 25 minutes-------X Axis
Total Distance traveled= 10 Laps Around the track---------Y Axis
25 Minutes= 10 Laps
1 Lap =2.5 Minute
→→y (Lap) = 2.5 x(Minute), where y is time taken, from x=0,1,2,3,......and y= Total number of Laps=0,1,2,3,4....