Question 845352
R*T=D for Rate, Time, Distance.


_____________speed________time_________distance
Betty________36___________t+1__________36(t+1)
Harry________48____________t___________48t


When will Harry reach Betty?
{{{36(t+1)=48t}}}
{{{36t+36=48t}}}
{{{48t-36t=36}}}
{{{12t=36}}}
{{{highlight(t=3)}}}
-
Is Harry's distance less than 140 miles?
{{{48*t=48*3=144}}};
NO.  If his calculated distance were less than 140 miles, he would have reached Better before she arrived home, but in this example, Betty already arrived home.