You don't have to use any equation or formula for this question. We will just use our imagination

(This solution is similar to my post here)
First, imagine the scene as you're on the ground, standing, looking at the runners. You see that they're 35 m away and running at the same direction at 1.85 m/s and 1.65 m/s.

Now, imagine the scene as you are Runner #2. You're 35 m behind Runner #1. You both start running. Ignore the grounds. What do you see? You see that Runner #1 gets closer at 0.2 m/s!

(it's 1.85 - 1.65). We just calculated the relative speeds. And now, he's 35 m ahead and coming closer at 0.2 m/s. When would you meet? It's so easy,

$\displaystyle V = \frac{x}{t}$

$\displaystyle 0.15 = \frac{35}{t}$

$\displaystyle t = \frac{35}{0.2}$

$\displaystyle t = \frac{350}{2} = 175$ seconds

Now you work the rest