Afisherman can row upstream at 2 mph and downstream at 8 mph. he started rowing upstream until he got tired and then rowed downstream to his starting point. how far did the fisherman row if the entire trip took 7 hours?

The fisherman rowed a total of 22.4 miles.

Explanation

Suppose, the distance from his starting point to the turn around point is mile.

Given that, upstream speed is 2 mph and downstream speed is 8 mph.

We know that,  

So, the time required to row miles upstream  hours and the time required to row miles downstream  hours.

As the entire trip took 7 hours, so the equation will be......

So, the fisherman rowed a total of (11.2×2) miles = 22.4 miles

answer:   b

step-by-step explanation:

x2 = 16

x can not be a negative number because 16 is positive

the only answer would be positive 8