12 minutes to drive 30 laps 38 minutes to drive 120 laps

12 : 30 and 48 : 120

6 is the highest common factor or 12 and 30, so dividing gives:

2 : 5

24 is the highest common factor of 48 and 120, so dividing gives:

2 : 5

so, the ratios are the same.

What exactly are you trying to figure out?