tolong jawab no.3,4,5 beserta caranya... terima Kasih yg sudah menjawab soal ya....

Bab Perbandingan

3. 20 hari <=> 6 orang
20 - 5 = 15 hari <=> a orang

a × 15 = 6 × 20
a = 120/15
a = 8

Tambahan pekerja = 8 - 6 = 2 orang

4. 90 km/jam <=> 3 jam 20 menit = 200 menit
75 km/jam <=> a menit

75 × a = 90 × 200
a = 18.000/75
a = 240 menit = 4 jam

5. Jarak pada peta
= Jarak sebenarnya × Skala
= 1.024 km × 1/2.560.000
= 102.400.000 cm × 1/2.560.000
= 40 cm