Question

Sahil reaches school at 9: 00 am and goes back at 2: 20 pm. How long does he remain in the school?

Answer 1

Hint: First of all, write the given times into 24 hours format and convert the return time of Sahil, which is 2: 20 pm, into 24 hours format. Now, subtract the time of Sahil reaching the school from the time of returning from the school to get the answer. Subtract the units properly, i.e. minutes of one time with the minutes of the other time and similarly the hours of one time from the hours of the other times.

Complete step by step answer:
Here we have been asked to find the time that Sahil spends in his school if he reaches school at 9: 00 am and returns back at 2: 20 pm. Let us first convert the times into 24 hours format.
Now, according to the 24 hours format of time, as soon as the time is 12: 00 pm in the afternoon, for the next hour that is 1: 00 pm according to the 12 hours format we add 1 and write the time as 13: 00. Similarly this addition of 1 goes on till the time reaches 00: 00 am which is 12: 00 am of the midnight that marks the starting of a new day.
Therefore the time 2: 30 pm can be written as 14: 20 according to the 24 hours format, so Sahil returns back at 14: 20. The time that Sahil remains in the school will be 14 hours 20 minutes – 9 hours. So we get,
\[\therefore \] Time that Sahil spends in school = 5 hours 20 minutes.
Hence, Sahil remains 5 hours and 20 minutes in school.

Note: Note that it is not too much necessary to convert the given times into 24 hours format from 12 hours format in the above question. You may get the answer by simple counting also, however you must remember the meaning of the terms ‘am’ and ‘pm’. Also, it will be good if you remember the relation between the two formats of time.