Question 170607
distance equals rate times time.    total distance is 11km so lets call the distance joe walks {{{x}}} and Jill's distance is {{{11-x}}}. Jill's rate is {{{2.5}}} ..lets call Joes {{{r}}} and time for both is the same at t= {{{2}}}.
:
11-x=2.5(2).....eq 1
x=r(2)..........eq 2
:
take x's value from eq 2 and plug it into eq 1
:
11-2r=5
:
-2r=-6
:
so Joes rate is{{{highlight(r=3)}}}km per hour