it takes dan 25 min. to walk to work. if he arrived at work at 6:40a.m when did he leave his house?
6:40 - 0:25 = ?
6:40- 0:25= 6:15
To determine when Dan left his house, we need to subtract the time it takes him to walk to work from the time he arrived at work.
First, let's convert the time Dan arrived at work to minutes. Since there are 60 minutes in an hour, 6:40 a.m. is equivalent to (6 x 60) + 40 = 400 minutes.
Next, subtract the time it takes Dan to walk to work (25 minutes) from the time he arrived at work (400 minutes).
400 minutes - 25 minutes = 375 minutes.
Now, we need to convert the result back to hours and minutes representation. Divide 375 minutes by 60 to get the number of hours: 375 ÷ 60 = 6 remainder 15.
So, Dan left his house at 6 hours and 15 minutes before he arrived at work.
To find Dan's departure time from his house:
6:40 a.m. - 6 hours = 12:40 a.m.
Therefore, Dan left his house at 12:40 a.m.