clkorm3 - first work out the load intensity:
174 kg/(1.25 ft x 1.75ft) = 79.5 kg/sq. ft.
(Note that this answer is given in feet so you must convert from inches to feet.)
If you take the longest length according to the first part of the answer, you must calculate the running load with a length of 1 ft 9 in rather than the 2 ft 4 in. In this case, your answer has to be in inches, rather than feet.
Running load: 174 kg/1 ft 9 in= 174 kg/21 inches = 8.23 kg/in.
I'm not sure if you had other answers to select from as you can definitely choose a better configuration of running load and intensity by working with the 2 ft 4 in length. Maybe all the other answers had incorrect units or scaling?