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1. \(\)Hoeveel seconden passen er in 51 minuten? \(\)
2. \(\)Hoeveel uren passen er in 1920 minuten?\(\)
3. \(\)Hoeveel seconden passen er in 71 minuten? \(\)
4. \(\)Hoeveel seconden passen er in 60 uren? \(\)
5. \(\)Hoeveel seconden passen er in 4 minuten? \(\)
6. \(\)Hoeveel uren passen er in 270000 seconden?\(\)
7. \(\)Hoeveel seconden passen er in 80 minuten? \(\)
8. \(\)Hoeveel uren passen er in 208800 seconden?\(\)
9. \(\)Hoeveel seconden passen er in 90 minuten? \(\)
10. \(\)Hoeveel uren passen er in 187200 seconden?\(\)
11. \(\)Hoeveel uren passen er in 331200 seconden?\(\)
12. \(\)Hoeveel uren passen er in 158400 seconden?\(\)

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Verbetersleutel

1. \(51 \text{ minuten}\\=51\times60\text{ seconden}\\=3060\text{ seconden}\)
2. \(1920 \text{ minuten}\\=1920:60\text{ uren}\\=32\text{ uren}\)
3. \(71 \text{ minuten}\\=71\times60\text{ seconden}\\=4260\text{ seconden}\)
4. \(60 \text{ uren}\\=60\times3600\text{ seconden}\\=216000\text{ seconden}\)
5. \(4 \text{ minuten}\\=4\times60\text{ seconden}\\=240\text{ seconden}\)
6. \(270000 \text{ seconden}\\=270000:3600\text{ uren}\\=75\text{ uren}\)
7. \(80 \text{ minuten}\\=80\times60\text{ seconden}\\=4800\text{ seconden}\)
8. \(208800 \text{ seconden}\\=208800:3600\text{ uren}\\=58\text{ uren}\)
9. \(90 \text{ minuten}\\=90\times60\text{ seconden}\\=5400\text{ seconden}\)
10. \(187200 \text{ seconden}\\=187200:3600\text{ uren}\\=52\text{ uren}\)
11. \(331200 \text{ seconden}\\=331200:3600\text{ uren}\\=92\text{ uren}\)
12. \(158400 \text{ seconden}\\=158400:3600\text{ uren}\\=44\text{ uren}\)