Question 984778
Convert the 9 minutes to hours.
{{{T=9/60=3/20}}}
So if we start the clock when the second truck passes the rest area, the first truck is,
{{{D[1]=R*T=60*(3/20)=9}}}{{{mi}}} ahead.
So then,
{{{R[1]*t+9=R[2]*t}}}
{{{60t+9=70t}}}
{{{10t=9}}}
{{{t=10/9}}}{{{hr}}}
or approximately,
{{{t=(10/9)60=600/9=66&2/3}}}{{{min}}}
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The distance from the rest area would be,
{{{D=70(10/9)=700/9=77&7/9}}}{{{mi}}}