To find the average speed of the entire trip, we need to calculate the total distance traveled and the total time taken.
Total distance:
- Distance while in town: 5 km
- Distance out of town: 5 km
- Total distance = 5 km + 5 km = 10 km
Total time:
- Time in town: 25 minutes
- Time out of town: 15 minutes
- Total time = 25 minutes + 15 minutes = 40 minutes
Average speed formula: Average speed = Total distance / Total time
Now, we can plug in the values:
- Total distance = 10 km
- Total time = 40 minutes
Average speed = 10 km / 40 min = 0.25 km/min
Hence, the average speed of the trip is 0.25 km/min.