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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There are 60 minutes in one hour. 0.5 hours is the same as half an hour, so half of sixty minutes is 30 minutes.
One-hundred-and-fifty minutes is equivalent to two-and-a-half hours.
There are 60 minutes in one hour, so to find the number of minutes in 13 and a half hours, you would multiply 13 by 60 and add half of 60. This gives you 13 x 60 + 30 = 810 minutes in 13 and a half hours.
Four and one half hours in 270 minutes
Well, sweetheart, if you can't handle basic math, I'm not sure what to tell you. One and a half hours is the same as 90 minutes. So, there you have it, 90 minutes in one and a half hours. Math doesn't have to be rocket science, darling.