I have two columns that contain time of two runs of executables.

I want to fomrat looks of the (Format - Conditional formating) cell
using follwoing rules

some color if both runs took same time
some another color if one run took more than 50% or other run time

Time display should be in format 40:25:10 (run took 40 hrs 25 min and
10 seconds).

Can you please help me to achive this in excel ?