Do you think you would have had a chance at 1st if you gave it an intensity 5?
If my maths is correct:
42:01 = 2521 seconds
Intensity 4 = 4/5 = 80%
100 / 80 = 1.25 (you could have performed 1.25 times better!!)
2521 / 1.25 = 2016.8 seconds
Potential time = 33:36.8
You coulda won comfy!!
Hahaha i never really know what to put my intensity ratings at, in the absence of reliable HR data and zones. Its always a bit of an ad-hoc guess.