Question 1011612
(a)
John's travel on foot is in two parts:  Walk and Run.  These two parts will total 2 kilometers.  Sum of the time will be  {{{1/4}}} hour.


x, time walking
y, time running
{{{system(5x+15y=2,x+y=1/4)}}}
Solve for x and y.
Now evaluate {{{5x}}}, the answer to this question.


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The solved system will be  {{{x=7/40}}} hour and {{{y=3/40}}} hour;
and the distance gone by walking before need to run is  {{{5(7/40)=(7/8)*kilometer}}}.



(b)
This is 18 minutes alloted time, or   {{{18/60=3/10}}} of hour.
The system is now  {{{system(5x+15y=2,x+y=3/10)}}}.
Solve this to find {{{x=1/4}}} which is 15 minutes, and {{{y=1/20}}}, which is 3 minutes of running.