1. 320 km selama 4 jam
Kecepatan rata2= 320 : 4 = 80 km/jam (C)
2. 75 km/jam = … m/menit
75×1000 / 1×60 =
75000 / 60 = 1250 m/menit (B)
3. 72 km/jam = km/menit
72/60 = 1,2 km/menit (D)
4. 500 m/ menit = km/jam
500:1000 / 1:60 =
0.5 / (1/60) = 0.5 ×60 = 30 km/jam (A)
5.Jarak = 150 km
Kecepatan = 60 km/ jam
Waktu = 150/60 = 2,5 jam = 2.30 jam
07.00 + 02.30 = 09.30 (B)
6. Kecepatan = 70 km/ jam
Waktu = 30 menit = 1/2 jam
Jarak = 70 × 1/2 = 35 km (C)
7. 06.30-09.00 = 2,5 jam
Jarak = 120 km
Kecepatan = 120/2,5 = 48 km/jam (B)
8. Waktu: 06.10-06.30 = 20 menit
kecepatan : 400 meter / menit
Jarak = 400 × 20 = 8000 meter (D)
9. Jarak A-B = 180 km
Kecepatan 1 = 35 km/jam,
Kecepatan 2 = 45 km/jam
Waktu mulai 06.45
Waktu berpapasan =
180: ( 35+45) = 180 : 80 = 2,25 jam = 2.15
06.45 + 02.15 = 09.00 (C)
10. 54 km/ jam = meter/ detik
54×1000 / 3600
54000/3600 = 15 meter/detik (C)
11. 0,2 × (3×60)
0,2 × 180 = 36 liter (B)
12. Awal = 1500 liter
Setelah 1,5 jam = 420 liter
Bocor = 420 + x = 1500
x = 1080 liter
1080:90 = 12 liter / menit
12 liter / menit = cc/ detik
12 × 1000 / 60
12000/60 = 200 cc/detik (D)
13. 1200 liter dalam 10 menit
120 liter/ menit = liter per detik
120 / 60 = 2 liter per detik (B)
14. 36 liter / detik
waktu = 1 jam = 3600 detik
jumlah = 36 × 3600 = 129600 liter
129.000/1000 = 129,6 m^3.C)
15. 6 m^3 / menit = liter/detik
6000/60 = 100 liter/detik (B)
16. 108.000 liter/ jam = m^3/menit
108/60 = 1,8 m^3 / menit (B)
17. debit = 48 m^3 / detik
waktu = 1 menit = 60 detik
jumlah = (48×1000)× 60
= 48.000 × 60 = 2.880.000 (A)
18. 0.5 m^3 / detik = m^3 / jam
0,5 / 1/3600 = 0,5 × 3600 = 1800 (D)
19. volume = 50×50×60 = 150.000 cm^3 = 150 liter
waktu = 15 menit
debit = 150 ÷ 15 = 10 liter/menit (A)
20. Debit = 500 liter / menit
Waktu = 1 jam = 60 menit
Jumlah = 500 × 60 = 30.000 liter = 30 m^3 (C)
Semoga bermanfaat