Question 1199233
Two-thirds of an hour, the amount of time Bob had traveled before Joe started to travel.
Amount of Bob's distance in this two-thirds hour:  {{{108*(2/3)=72}}} kilometers.


Joe's approach speed to Bob, {{{124-108=16}}} kph.


How much time for Joe to catchup to Bob?
{{{16*x=72}}}, to close the 72 kilometer distance, x amount of hours;
{{{x=72/16}}}

{{{highlight(x=4.5)}}}, four hours thirty minutes