Question 1209001
If using RT=D rule then also T=D/R.


If letting x equal to distance done by running then

{{{x/6+(87-x)/25=5}}}

common denominator is 150.

{{{150(x/6+(87-x)/25)=150*5}}}

{{{25x+6*87-6x=750}}}

{{{(25-6)x=750-522}}}

{{{19x=750-522}}}

{{{x=228/19}}}

{{{x=12}}}----------the distance ran