The problem is as follows:

> 
> Richard is resting below the shadow of a tree situated at $20$ meters
>  in the direction $N53^{\circ}E$ from his home and his friend Mark is
>  situated at $5\,m$ from the direction $S37^{\circ}W$ of Richard's
>  house. Mark moves formard with a constant speed of $5\frac{m}{min}$
>  in the direction $N37^{\circ}W$. Find the distance between them after
>  $4$ minutes have elapsed.
> 
> 
> 

The alternatives in my book are as follows:

$\begin{array}{ll}
1.&3\sqrt{41}\,m\\
2.&41\,m\\
3.&\sqrt{689}\,m\\
4.&31\,m\\
\end{array}$

I tried all sorts of arrangements to get this correctly but I'm still confused if it can actually be solved. Can someone help me with the bearing angles?.

So far what I was able to spot is summarized in my drawing from below. But there's a triangle which I cannot relate to obtain the requested length.

[![Sketch of the problem](https://i.stack.imgur.com/6P0Y9.png)](https://i.stack.imgur.com/6P0Y9.png)

So can someone guide me in the right path for this problem?. I'd appreciate that an **answer must contain a drawing** to see exactly how can I make a side for that triangle or a way to find that distance.