There are 60 minutes in one hour. multiply the number of minutes in an hour (60) by the number of hours (in this case 45).
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I believe there is an hour and 45 minutes because 75 means 3 quarters from a 100% and 45 means also 3 quarters from 60 (which are the minutes from an hour) .and therefore...1.75 hours equals an hour and 45 minutes
about five hours
3.5 hours is 210 minutes.
forty-five
The real amount is found like this: there are sixty seconds in a minute and 60 minutes in an hour, so first you multiply sixty by sixty (60*60 or 602) to equal 3600. You then multiply 3600 by five to get the amount for five hours (3600*5) to equal 18000. For minutes, there are sixty seconds in a minute, and five minutes, so you multiply sixty by five (60*5) to equal three hundred. You then have fifteen seconds, and there are fifteen seconds in fifteen seconds, so you add them all together (18000+300+15) to equal 18315 as your total amount of seconds.