Question 892116
Let x = # of hours it takes for the marshall to catch up with the robber.
Then x + 1/3 = # of hours the robber has been on the run before he is caught.

==> {{{14(x+1/3) = 15x}}}
==> {{{14x + 14/3 = 15x}}}
==> {{{x = 14/3}}} hours, or after 4 hours and 40 minutes.