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Verified answer
Anto : 11 jam dalam 1 jamBasir : 9 jam dalam 1 jam
Anto : 1/11
Basir : 1/9
Bersama = 1/11 + 1/9 = 9+11/99 = 20/99.
Dibalik jadinya 99/20 = 4 jam 19/20
4 jam (19/20 x 60 menit) = 4 jam 57 menit