Final answer:
The second group hiked at a constant speed of 57.6 mph.
Step-by-step explanation:
The first group of hikers hiked 6 mph out to the camp and 4 mph back. Let's say the distance to the camp is x miles. The time taken to go to the camp would be x/6 hours, and the time taken to come back would be x/4 hours. As both groups returned to the camp at the same time, the total distance traveled by each group is 24 miles.
So we have the equation:
x/6 + x/4 = 24
Multiplying through by 12 to clear the denominators, we get:
2x + 3x = 288
5x = 288
x = 57.6
Therefore, the second group hiked at a constant speed of 57.6 mph.