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3/4 jam = 45 menit =2700 detik
5 jam =300 menit =18000 detik
1/2 jam =30 menit =1800 detik
dit:2 3/4 jam + 5 1/2 jam=....detik
penyelesaian : 2 3/4 jam + 5 1/2 jam =165 menit + 330 menit
=9900 detik + 19800 detik
= 29700 detik
Smoga membantu