Question 107682
You must begin with the firmly held conviction that nobody picked up Town A and moved it during the 8+ hours that Ricky was gone.

We know that {{{d=rt}}}


For the initial trip, we only know that t = 3, so:


{{{d=3r}}}


For the return trip, we know that t = 5 and r is 15 mph slower, so:


{{{d=5(r-15)}}}


Since the distance going is the same as the distance returning, we can say:


{{{3r=5(r-15)}}}


Simplify and solve:


{{{3r=5r-75}}}
{{{-2r=-75}}}
{{{r=37.5}}} mph


Check:

Does {{{3*37.5=5(37.5-15)}}}?  I'll leave the arithmetic for you.