This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
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 =)