You first need to know how much miles it takes on the trail. Then you look 20 x 3 is one hour. And if the 3 group said it takes 2 hours waking for them its like this, the first group takes one hour to go thru the trail, but the second group takes and hour and half the 3 group takes 2 hours.
I wish this helps. :)
ANSWER



EXPLANATION
The given quadratic equation is:

We rewrite in the standard quadratic equation form to obtain,

Comparing this to the general standard quadratic equation.

We have my



In this problem the big angle will be equal to two times the smaller angle so the correct expression is:

Now we can rewrite the equation so:
The answer is 3 because all you have to do is plug in the answer and then you have to solve the answer and go from there.