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6 laps = 4.5 minutes. 

Now we need to set up a proportion to determine minutes per lap.

6/4.5 = 1/x

Cross multiply

6x= 4.5*1
6x= 4.5
6x/6 = 4.5/6
x= 0.75

It takes 0.75 minutes per lap.

Final answer: 0.75 minutes per lap
Neuron
6 laps ... 4 1/2 = 9/2 minutes
1 lap ... x minutes = ?

If you would like to know what is the rate in minutes per lap, you can calculate this using the following steps:

6 * x = 9/2 * 1
6 * x = 9/2     /6
x = 9/2 / 6
x = 9/12
x = 3/4 minute

The correct result would be 3/4 minute per lap.