Hehe I'm not sure I can explain the trip method either

But from The Holy Contract of Antioch...
A "trip" = 243 miles. Any flight between two airports 243 miles (or less) apart is a "trip." Every 40 additional miles between the two airports is 1/10 trip. (Apparently the previous union reps couldn't divide 243 by 10)

There is also a time calculation involved, where a standard trip = 55 minutes. Every 5 minutes over that = 1/10 trip, so if you're in a holding pattern, or vectored to East Jesus, or told to maintain 170 kts 100 miles out, the pay will be based on the greater of the "time trip" or the "distance trip." Except the first 7 minutes doesn't count, so it isn't "over" for time until you're 12 minutes late, so 12 minutes is 1/10 trip, and 17 minutes is 2/10, etc.
Confused yet? I know I am
There is some debate ongoing over just how the "comparable hourly rate" is being determined, so I won't hazard a guess as to how it really is, other than to say that the union, the company, and other companies pretty much all use whichever "conversion" appears to be most advantageous to their negotiating position, as we'd expect, I guess

But, for a rough estimate, if 55 minutes = 1 trip, then 60 min = 1.09 trips, so add about 10% to the above trip rates for an "hourly rate."