Mathematics
lrfranck
3

3 h 6 min 45 sec+8h 55 mins 20 sec

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(2) Answers
foreversmilin

Convert them both to minutes to get: 186 mins and 45 sec + 535 mins and 20 sec Add to get: 772 mins and 5 sec

BettieZumbrunnen

   3 hours . . . 6 minutes . . . 45 seconds + 8 hours . . 55 minutes . . . 20 seconds   ________________________________  11 hours . . 61 minutes . . . 65 seconds But 65 seconds = 1 minute . . . 5 seconds  11 hours . . 62 minutes . . . 5 seconds But 62 minutes = 1 hour . . . 2 minutes  12 hours . . 2 minutes . . . 5 seconds I think this is regrouping, but with 60s instead of 10s.

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