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1. \(\)Hoeveel seconden passen er in 85 minuten? \(\)
2. \(\)Hoeveel uren passen er in 140400 seconden?\(\)
3. \(\)Hoeveel uren passen er in 129600 seconden?\(\)
4. \(\)Hoeveel uren passen er in 82800 seconden?\(\)
5. \(\)Hoeveel minuten passen er in 3300 seconden?\(\)
6. \(\)Hoeveel uren passen er in 2400 minuten?\(\)
7. \(\)Hoeveel seconden passen er in 6 uren? \(\)
8. \(\)Hoeveel seconden passen er in 21 uren? \(\)
9. \(\)Hoeveel seconden passen er in 42 minuten? \(\)
10. \(\)Hoeveel seconden passen er in 45 minuten? \(\)
11. \(\)Hoeveel uren passen er in 288000 seconden?\(\)
12. \(\)Hoeveel seconden passen er in 68 uren? \(\)

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Verbetersleutel

1. \(85 \text{ minuten}\\=85\times60\text{ seconden}\\=5100\text{ seconden}\)
2. \(140400 \text{ seconden}\\=140400:3600\text{ uren}\\=39\text{ uren}\)
3. \(129600 \text{ seconden}\\=129600:3600\text{ uren}\\=36\text{ uren}\)
4. \(82800 \text{ seconden}\\=82800:3600\text{ uren}\\=23\text{ uren}\)
5. \(3300 \text{ seconden}\\=3300:60\text{ minuten}\\=55\text{ minuten}\)
6. \(2400 \text{ minuten}\\=2400:60\text{ uren}\\=40\text{ uren}\)
7. \(6 \text{ uren}\\=6\times3600\text{ seconden}\\=21600\text{ seconden}\)
8. \(21 \text{ uren}\\=21\times3600\text{ seconden}\\=75600\text{ seconden}\)
9. \(42 \text{ minuten}\\=42\times60\text{ seconden}\\=2520\text{ seconden}\)
10. \(45 \text{ minuten}\\=45\times60\text{ seconden}\\=2700\text{ seconden}\)
11. \(288000 \text{ seconden}\\=288000:3600\text{ uren}\\=80\text{ uren}\)
12. \(68 \text{ uren}\\=68\times3600\text{ seconden}\\=244800\text{ seconden}\)