A coach is training students. The training involves jogging on a circular track. Jogging starts at from the start line. Below is the record of how long it takes for each runner to return to the start line.
| Runner | Returns to start line | Track length |
|---|---|---|
| Every minutes | ||
| Every minutes | ||
| Every minutes |
According to the coach's notes, until exactly , the three runners have passed the start line together times.
If the average speed of runner is meters per second, then the length of the track is ....