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1. \(\)Hoeveel seconden passen er in 28 minuten? \(\)
2. \(\)Hoeveel seconden passen er in 30 uren? \(\)
3. \(\)Hoeveel uren passen er in 2280 minuten?\(\)
4. \(\)Hoeveel seconden passen er in 88 uren? \(\)
5. \(\)Hoeveel uren passen er in 2640 minuten?\(\)
6. \(\)Hoeveel uren passen er in 2520 minuten?\(\)
7. \(\)Hoeveel seconden passen er in 35 uren? \(\)
8. \(\)Hoeveel seconden passen er in 69 uren? \(\)
9. \(\)Hoeveel seconden passen er in 72 uren? \(\)
10. \(\)Hoeveel uren passen er in 313200 seconden?\(\)
11. \(\)Hoeveel minuten passen er in 2880 seconden?\(\)
12. \(\)Hoeveel minuten passen er in 1020 seconden?\(\)

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Verbetersleutel

1. \(28 \text{ minuten}\\=28\times60\text{ seconden}\\=1680\text{ seconden}\)
2. \(30 \text{ uren}\\=30\times3600\text{ seconden}\\=108000\text{ seconden}\)
3. \(2280 \text{ minuten}\\=2280:60\text{ uren}\\=38\text{ uren}\)
4. \(88 \text{ uren}\\=88\times3600\text{ seconden}\\=316800\text{ seconden}\)
5. \(2640 \text{ minuten}\\=2640:60\text{ uren}\\=44\text{ uren}\)
6. \(2520 \text{ minuten}\\=2520:60\text{ uren}\\=42\text{ uren}\)
7. \(35 \text{ uren}\\=35\times3600\text{ seconden}\\=126000\text{ seconden}\)
8. \(69 \text{ uren}\\=69\times3600\text{ seconden}\\=248400\text{ seconden}\)
9. \(72 \text{ uren}\\=72\times3600\text{ seconden}\\=259200\text{ seconden}\)
10. \(313200 \text{ seconden}\\=313200:3600\text{ uren}\\=87\text{ uren}\)
11. \(2880 \text{ seconden}\\=2880:60\text{ minuten}\\=48\text{ minuten}\)
12. \(1020 \text{ seconden}\\=1020:60\text{ minuten}\\=17\text{ minuten}\)