Final answer:
It takes Mai approximately 6.4 minutes to complete 4 laps of the track.
Step-by-step explanation:
To find out how many minutes it takes for Mai to complete 4 laps of the track, we need to divide the total distance (400 meters) by her speed (250 meters per minute). This will give us the time it takes for Mai to complete 1 lap, and we can then multiply that by 4 to get the total time for 4 laps.
So, to find the time for 1 lap:
Time for 1 lap = Distance/Speed = 400 meters / 250 meters per minute = 1.6 minutes
Now, to find the total time for 4 laps:
Total time for 4 laps = Time for 1 lap x 4 = 1.6 minutes x 4 = 6.4 minutes
Therefore, it takes Mai approximately 6.4 minutes to complete 4 laps of the track.