2003 Accord brakes pad anomaly

With 30,000 km from new, my accord wore out its rear brake pads with the
front ones 50% worn.
This seems weird to me ..... anyone had similar experience or should I query
binding pads ?
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I recently measured mine all around after being told by the dealership that
I only had a millimeter left on the front ones. That turned out to be a
lie, as they had 6 mm left, minus a couple for the squeeler, which
calculated out to be about 23,000 left on them.

The numbers showed that the rear ones would last about 54,000 miles,
compared to the front 58,000 miles, but that's pretty close.

How did you know they were worn out? Did you change them yourself?
How do you know the front ones are 50% worn. Did you measure them? Do you
know how thick they were when they were new?

Wayne