0.75 of an hour.
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It is: 45/60 = 0.75 of a hour
Time = distance/speed = 16/45 = 0.35556 hours that is the answer in decimal form. Now if you wish you can convert decimal time to hours and minutes: 0.35556 hours = 0.35556 * 60 = 21.3333 minutes 0.3333 minutes = 0.3333 *60 = 20 seconds so the answer in this form is: 21 minutes and 20 second
4.75 hours
It is 45 minutes after midnight, or a quarter to one in the morning.
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