4. 720 detik = 720 x 1/60 menit = 720/60 menit = 12 menit
5. 180 menit = 180 x 1/60 jam = 180/60 jam = 3 jam
6. 45 menit = 45 x 1/60 jam = 45/60 jam = 3/4 jam
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7. 90 detik = 90 x 1/60 menit = 90/60 menit = 3/2 menit atau 1 1/2 menit
8. 300 detik = 300 x 1/60 menit = 300/60 menit = 5 menit
9. 27 menit + 480 detik = 27 menit + (48/60 menit) = 27 menit + 0,8 menit = 27,8 menit
10. 18 jam – 7200 detik = (18 x 60 menit) – (7.200 x 1/60 menit) = 1.080 menit – 120 menit = 960 menit