How many minutes between?

This task is about working out the difference between two times in minutes.
 
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 How many minutes are there between each of the following times on the same day?

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a)  3:30 p.m. and 5:30 p.m.  minutes

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b)  4:20 p.m. and 9:05 p.m.  minutes

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c)  8:55 a.m. and 2:20 p.m.  minutes

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d)  3:40 a.m. and 11:30 p.m.  minutes