The roadblock

A bus, one hour after starting, meets with a roadblock that detains it for 30 minutes, after which he proceeds at 3/4 of its former speed and arrives 3.5 hours late. Had the roadblock been 144 kilometers farther along the road, it would have arrived only 3 hours late.

What is the length of the trip?

Clarification: The roadblock always detains a bus for 30 minutes and the bus then proceeds at 3/4 of the original speed.

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