To find the average speed of the entire trip, we first need to calculate the total distance and the total time.
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Total Distance:
- The cyclists traveled 5 km to the edge of town and then another 5 km out of town.
- Total distance = 5 km + 5 km = 10 km
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Total Time:
- The time taken to travel the first 5 km is 25 minutes.
- The time taken to travel the second 5 km is 15 minutes.
- Total time = 25 minutes + 15 minutes = 40 minutes
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Average Speed:
- Average speed = Total distance / Total time
- Average speed = 10 km / 40 minutes = 0.25 km/min
Therefore, the average speed of the trip is 0.25 km/min.