Plz help is you know the answer

The answer is b.)

Step-by-step explanation:

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Let x be the unknown distance from his scout camp to another camp. The time it takes for him to travel upstream is x / (5 + 3) and downstream x / (5 - 3)

The total time for him to travel forth and back is 10 hr. This may be mathematically expressed as,
              
                                         x/8 + x/2 = 10

Solving for x in this equation gives 16. Thus, the distance to the camp is 16 miles.