tolong jawab dengan cara

1. 1/5 jam = 1/5 × 60 = 12 menit
2. 2 jam = 2 × 60 = 120menit
3. 45 menit = 45 × 1/60 = 3/4 jam
4. 7200 detik = 7200 ÷ 3600 = 2jam
5. 480 detik = 480 ÷ 60 = 8 menit