tolong kerjakan no 2 & 5

2) kec = 65 km/jam
waktu = 1 jam 12 mnt = 1 1/5 = 6/5 jam
jarak = kec × waktu
= 65 km/jam × 6/5 jam
= 78 km
kec baru = jarak ÷ waktu
= 78 km ÷ 1 jam
= 78 km/jam

5) total proyek = 6 × 15 = 90
kekurangan hari = 15 - 13 = 2
jumlah pekerja = 90 ÷ 2 = 45
tambahan pekerja = 45 - 6 = 39 org