Math
posted by Jerald .
4 hours 18 min 11 sec 3 hours 15 min 4 sec = 1 h 3 min 7 s
6 hours 7 minutes 42 sec + 2 hrs 12 min 38 sec=
8 hours 19 minutes 80 seconds

First one is right.
Second, 80 seconds = 1 minute 20 seconds
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