Computer printing

This task is about calculating with rates.
   illustration: printer
The printer for a computer prints 5 pages each minute.

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a)  How many pages will it print
i) in 4 minutes?  
ii) in 1 hour?  
iii) from 9:20 a.m. until 9:45 a.m.?  

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b)  How long will the printer take to print
i) 45 pages?   minutes
ii) 200 pages?   minutes
iii) 1200 pages?   hours

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c)  Anita's computer prints 30 pages in 5 minutes.
How many pages does it print each minute?  

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