Math Help - Along the straight road

I need help in the below problem.
Thanks

2. Re: Along the straight road

Originally Posted by kingman
I need help in the below problem.
Thanks
1. Let r denote the distance XA and s the distance BY. Use the definition of speed: $speed = \frac{distance}{time}~\implies~ time = \frac{distance}{speed}$

2. You can extract a system of simultaneous equations from the text:

$\frac r4 = \frac{s+120}6~\wedge~\frac{r+120}6=\frac s4$

Solve for r and s.