7hours12seconds-3hours42seconds
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It is 3hours 30 seconds is answer
Solution borrow 7 hours and reduce to 6
Now 6-3=3 so hours is three
Now take that borrowered one to 12 seconds becomes 60 seconds now 72-42 =30 seconds
Solution borrow 7 hours and reduce to 6
Now 6-3=3 so hours is three
Now take that borrowered one to 12 seconds becomes 60 seconds now 72-42 =30 seconds
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