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1 minute=60 seconds
1 hour=60 minutes

The answers:
1)840 seconds(\frac{1 minute}{60 seconds})=14 minutes
2)960 minutes(\frac{1 hour}{60 minutes})=16 hours
3)19 minutes(\frac{60 seconds}{1 minute})=1,140 seconds
4)5 hours(\frac{60 minutes}{1 hour})=300 minutes
5)1,260 minutes(\frac{1 hour}{60 minutes})=21 hours

Hope this helps =)
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