Question 787298
You just account for time and rely on movement using rate*time=distance.
{{{r*h=d}}} for rate, time in hours, distance in miles.

divide both sides by r and have:  {{{h=d/r}}}


The time traveling was {{{4-1&1/2}}} hours.
Times for going and returning are unknowns, x and y.

45*x+55*y= distance that you do not know, say d.
{{{45x+55y=d}}}
and {{{x+y=2&1/2}}}


So far, your problem is incomplete.  You have THREE variables but only TWO equations.