1.75 Hours, because an hour is sixty minutes, each 15 min period counts as 1/4 of an hour, or 0.25 hours.
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1 hour and 45 minutes equal exactly 1 hour and 45 minutes. If you prefer fractions, it is 1 and 3/4 hours.
1 hour = 60 minutes, so 45 minutes = 45/60 hour ⇒ 7 hours 45 minutes = 7 + 45/60 hours = 7 + 3x15/4x15 hours = 7 + (3 ÷ 4) hours = 7.75 hours
45 minutes is 3/4 of an hour
105 minutes (1 hour + 45 minutes = 60 minutes + 45 minutes)
45 minutes is closer to 1 hour - as the minutes have already left 30 minutes and are advancing towards 1 hour or 60 min