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42) 3ha=30.000m^2
150are=15.000m^2
30.000-15.000-7.000
=8.000m^2
43)waktu=jarak/kecepatan
=900/3=300detik
300detik=300/60
=5menit
40. Volume = debit × waktu
Volume = 30 m^3 per menit × 25 menit
Volume = 750 m^3
42. Diketahui : luas lahan total : 3 ha
Luas lahan padi : 150 are (1.5 ha)
Luas lahan palawija: 7000 m^3 (0.7 ha)
Ditanyakan : luas tanah jagung
Solusi : 3 ha - 1.5 ha - 0.7 ha
: 0.8 ha = 8000 m^2
43. Waktu = jarak / kecepatan
Waktu = 900 / 3
Waktu = 300 detik = 5 menit