A fisherman can row upstream at 2 mph and downstream at 8 mph. He started rowing upstream until he got tired and then rowed down
1 answer:
The fisherman rowed a total of 22.4 miles.
<u><em>Explanation</em></u>
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
You might be interested in
First we are going to find the common denominator of both fractions. To do that, we are going to multiply their denominators:
Now we can rewrite our expression using the common denominator:
Finally, we can use the trig identities:
and 
to simplify our trig expression:
We can conclude that the correct answer is the fourth one.
Now we can rewrite our expression using the common denominator:
Finally, we can use the trig identities:
We can conclude that the correct answer is the fourth one.
Step 2: She did not simplify under the square root correctly
under the square root:
(-6)^2 =36
and -4(5)(-8) =160
therefore under the square root it needs to be square root of 36+160 which is square root of 196.
That answer is 14 when square rooted
