Find the sum: a)30 minutes 15 seconds + 12 hours 50 seconds? b) 4 hours 25 minutes+ 7 hours 35 minutes? c) 10 hours 20 seconds? ???
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(b) 4 hours 25 minutes + 7 hours 35 minutes. (c) 10 hours 20 seconds + 16 hours 55 seconds. .
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