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2 jam = 60 mnt x 2 =120 mnt
120 mnt=7200 dtk
15 mnt = 900 dtk
jadi 7200+900+20 =8120 detik
2 jam=7.200 detik.....15 menit=900 detik.....jadi jawabannya=(2jam×3600)+(15menit x60)+20 detik= 8.120 detik