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1 = 60'
1' = 60''

а) 3712' + 57'12'' = 4219'12''
б) 49'33'' + 24'28'' = 73'61'' = 74'1'' = 114'1''
в) 527' + 356' = 883' = 923'
г) 417'29'' + 145'38'' = 562'67'' = 563'7'' = 63'7''
д) 23'52'' + 8'' = 23'60'' = 24'
e) 8959'59'' + 1'' = 8959'60'' = 8960' = 90