1. 5 minutes = _______ seconds
2. 400 minutes = _______ hours
3. 12 hours = ________ minutes
4. 6 days = _______ hours
5. 15 hours = _______ days
6. 2 days = _______minutes
7. 5 weeks = _______ days
8. 10 weeks = _______ hours
9. 1680 hours = _______ weeks
10. 60 months = _______ years
11. 3 years = ______ months
12. 36 months = _______ years
13. 0.5 years = ______ months
14. 4 decades = ______ months
15. 10 decades = _______ years
16. 50 years = ______ decades
17. 2 centuries = _______ months
18. 350 years = _______ decades
19. 100 decades = ______ centuries
20. 6,000 years = ______ milleniums​