Perform operations with the translation: 1 h is 14 min. old +3ch.56 min. 4 Parts 32min-2ch.42 min. 16 h 23 min. +12ch.37 min. 36 min. 15 sec. - 14 min. 48 sec.

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1) 5 h 10 min. 2)7 h 14 min. 3)1 days 5 h 4) 21 min. 27sek1ch =60 minutes mean 60+14+(180+56) =310minut or 5 hours and 10 minutes 2)240+32-(120+42)=110 minutes or 1 hour and 50 minutes 3)960+23+(720+37)=1740 minutes or 29 hours 4)1 minutes =60 sec. = (2160+15)-(840+48)=1287 seconds or 21 minutes and 27 seconds.
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Answer add