There is not a way to answer this question. You will have to tell me the rate he was going.
Two and a half laps
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It is 2.5 laps/(3+6/60 minutes) = 2.5/3.1 =0.81 laps per minute, approx.
3 laps takes 2.5 minutes → 1 lap takes 2.5/3 minutes → 20 laps take 2.5/3 × 20 minutes = 16⅔ minutes = 16 minutes 40 seconds.
10 minutes
About 10 minutes.
30 to 90 minutes
At that rate, 133 minutes.
Cooking time for 2.35lbs will be 47 minutes at that rate.
about 10 minutes but this happens slowly!
That depends on your rate of speed. At 60 mph, it will take 16 minutes. At 30 mph, it will take 32 minutes.
50 minutes.