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1/4 jam=60×1/4=15 menit
waktu para petugas bekerja
Andi=1 jam 45 menit
Budi=2 jam 45 menit
Deni=2 jam 15 menit
Lukman=2 jam 45 menit
Mona=2 jam 45 menit
Santi=4 jam
supaya lebih mudah hitung yg menit terlebih dahulu
45+45+15+45+45=195 menit
195 menit=3 jam 15 menit
1+2+2+2+2+4=13 jam
13 jam+3 jam 15 menit
=16 jam 15 menit