Question 840440
They meet when the sum of the distances they travel separately is 100 miles.  A travels for 2+t hours, because he left on the trip three hours earlier than B.  B travels for some t hours.  When that all makes sense, continue reading.


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READY NOW?


{{{highlight_green(R*T=D)}}}, Rate, Time, Distance


{{{highlight_green(30(t+2)+40t=100)}}}
{{{3(t+2)+4t=10}}}
{{{3t+6+4t=10}}}
{{{7t=4}}}
{{{highlight(t=4/7)}}} hour or about 34 minutes, maybe slightly longer.