Question

Find the interval from 9:45 A.M. to 2:30 P.M. Simon started for morning walk at 5:50 A.M. She came back at 7:00 A.M. How long did he walk?

Answer 1

Hint: We first change the hours to minutes to find the difference properly. We consider the difference in the form subtraction. We find the solutions.

Complete step by step solution:
To find the interval between two clock times we need to convert the hours into minutes to find the difference.
After noon at 12:00 P.M., we start counting from 1 again.
Therefore, 2:30 PM will be considered as $12:00+2:30=14:30$.
Now we take 1 hour from the hour marks and add 60 minutes in the minute mark.
So, $14:30$ changes to $14:30=13:\left( 60+30 \right)=13:90$.
Now we find an interval of 9:45 from 13:90.
The interval is $13:90-9:45=4hour45\min $.
Therefore, the interval between 9:45AM to 2:30PM is 4 hour 45 min.

Simon started for morning walk at 5:50 A.M. She came back at 7:00 A.M.
7:00 AM can be considered as 6:60.
The difference between 6:60 and 5:50 is $6:60-5:50=1hour10\min $.
Therefore, Simon walked for 1 hour 10 minutes.

Note:
We often consider the times as the unit changes. We find differences with respect to the hours and minutes, not the time value. The reason behind this is that minute marks can not be equal to 90.