Mr. Smith was deciding when to get up in the morning. He needed
45 minutes to get ready for school. His bus ride took 25 minutes.
He wanted to get to school 20 minutes early. If school starts at
8:30, what time should he get up?
get to school at 8:10
so get on the bus at 8:10 - 25 minutes = 7:70 - 25 = 7:45
start putting on shoes at 7:45 - 45 min = 7:00
or
:45 + :25 + :20 = :90
8:30 - :90 = 7:90 - :90 = 7:00
To determine what time Mr. Smith should get up, we need to add up the time it takes for him to get ready, the time for his bus ride, and the extra time he wants to be at school early.
First, let's start with the time he needs to get ready for school, which is 45 minutes.
Next, we add the time for his bus ride, which takes 25 minutes.
Then, we add the extra time he wants to be at school early, which is 20 minutes.
So far, we have:
45 minutes (getting ready) + 25 minutes (bus ride) + 20 minutes (extra time) = 90 minutes.
To calculate the time Mr. Smith should get up, we need to subtract 90 minutes from the time school starts. School starts at 8:30, so we subtract 90 minutes from 8:30.
To do this, we convert 8:30 to minutes: 8 hours * 60 minutes + 30 minutes = 510 minutes.
Now, we subtract 90 minutes from 510 minutes:
510 minutes - 90 minutes = 420 minutes.
To convert 420 minutes back to hours and minutes, we divide it by 60, where the quotient is the number of hours and the remainder is the number of minutes:
420 minutes ÷ 60 minutes = 7 hours remainder 0 minutes.
Therefore, Mr. Smith should get up 7 hours before school starts, which is 7:00 AM.