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angel2021342

So you want to find how many minutes per lap, so you divide 18 by 4 and you get 4 1/2 minutes. (4.5 min)

NobleAlexander

18 min/4 laps 

How I got the ratio above is with the information. For every 18minutes he jogs 4 laps. So 18 minutes per 4 laps. Or as above 18/4

It reduces to 9/2, which is 4.5 minutes per 1 lap. 

In other words the answer is: 4.5min