Question 1069873
<pre>
CAR           SPEED      TIME     DISTANCE
A              50        t+2       d
B              70         t        d
</pre>


t, how much time for B to catchup with A
d, distance traveled when catchup occurs


RT=D rule gives this system of equations:
{{{system(50(t+2)=d,70t=d)}}}


The first question can use the equating of d.
{{{50(t+2)=70t}}}
{{{5t+10=7t}}}
{{{10=2t}}}
{{{highlight(t=5)}}}


Use that to find the value for d.