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lha kan 1 jam = 3600 s
3600 x 2 + 900 = 8100 s
900 s = 30 Menit
1 jam = 60 x 60 = 3600
2 jam = 7200 detik
8100 - 7200 = 900
900 : 60 = 15 menit
jadi 8100 detik adalah 2 jam 15 menit