Question 846615
{{{D1=30*(T+3)}}}
{{{D2=45*T}}}
where T is zero at 3:00.
Find T when D=500.
{{{D=D1+D2}}}
{{{30*(T+3)+45*T=500}}}
{{{30T+90+45=500}}}
{{{30T=365}}}
{{{T=365/30=73/6=12+1/6}}}hours
1/6 hour = 10 minutes.
SInce time was zero at 3:00 PM, the trains will be 500 miles apart at 3:10AM.