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The distance between town R and town S is 96 km.
Alvin and Simon left town R at 0600 and drove towards town S.Alvin drove at a speed of 80 km/h.
Simon's speed was 20 km/h slower than Alvin’s.
Halfway through the journey, Alvin took some rest and waited for Simon to catch up with him.
How long did Alvin rest?