Question 397878
: A man can run 3 kilometers faster than he walks.
 It takes him 4 hours to run 30 kilometers. How long would it take him to walk the same distance?
:
Let w = his walking speed
then
(w+3) = his running speed
:
Therefore: (s+3) = {{{30/4}}}
4(w+3) = 30
4w + 12 = 30
4w = 30 - 12
w = {{{18/4}}}
w = 4.5 km/hr is his walking speed
therefore:
{{{30/4.5}}} = 6{{{2/3}}} hrs to walk it