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1. \(\)Hoeveel minuten passen er in 55 uren? \(\)
2. \(\)Hoeveel seconden passen er in 25 uren? \(\)
3. \(\)Hoeveel seconden passen er in 30 minuten? \(\)
4. \(\)Hoeveel seconden passen er in 71 minuten? \(\)
5. \(\)Hoeveel minuten passen er in 3480 seconden?\(\)
6. \(\)Hoeveel seconden passen er in 19 uren? \(\)
7. \(\)Hoeveel uren passen er in 262800 seconden?\(\)
8. \(\)Hoeveel seconden passen er in 4 uren? \(\)
9. \(\)Hoeveel seconden passen er in 80 minuten? \(\)
10. \(\)Hoeveel seconden passen er in 91 uren? \(\)
11. \(\)Hoeveel seconden passen er in 39 uren? \(\)
12. \(\)Hoeveel seconden passen er in 23 minuten? \(\)

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Verbetersleutel

1. \(55 \text{ uren}\\=55\times60\text{ minuten}\\=3300\text{ minuten}\)
2. \(25 \text{ uren}\\=25\times3600\text{ seconden}\\=90000\text{ seconden}\)
3. \(30 \text{ minuten}\\=30\times60\text{ seconden}\\=1800\text{ seconden}\)
4. \(71 \text{ minuten}\\=71\times60\text{ seconden}\\=4260\text{ seconden}\)
5. \(3480 \text{ seconden}\\=3480:60\text{ minuten}\\=58\text{ minuten}\)
6. \(19 \text{ uren}\\=19\times3600\text{ seconden}\\=68400\text{ seconden}\)
7. \(262800 \text{ seconden}\\=262800:3600\text{ uren}\\=73\text{ uren}\)
8. \(4 \text{ uren}\\=4\times3600\text{ seconden}\\=14400\text{ seconden}\)
9. \(80 \text{ minuten}\\=80\times60\text{ seconden}\\=4800\text{ seconden}\)
10. \(91 \text{ uren}\\=91\times3600\text{ seconden}\\=327600\text{ seconden}\)
11. \(39 \text{ uren}\\=39\times3600\text{ seconden}\\=140400\text{ seconden}\)
12. \(23 \text{ minuten}\\=23\times60\text{ seconden}\\=1380\text{ seconden}\)