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You have to know that there are 60 minutes in an hour.

"2 and one half hours" = 2.5 hours

(2.5 hours)*(60 minutes/hour) = 150 (hours*minutes/hour)

= 150 minutes

Note that you multiply & divide the units as if they were numbers. This is dimensional analysis.

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Q: How many minutes are in a 2 and one half hours?
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