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1 jam = 60 menit = 3600 sekon
2 jam = 7200 sekon
1 menit=60 sekon
15 menit=15x60=900
jadi, 2 jam 15 menit = 7200 sekon + 900 sekon = 8.100 sekon
15mnt = 15×60s = 900s
2 jam + 15 mnt = 7200s + 900s = 8100s jadi jawabannya D