Question

An aeroplane leaves Bengaluru at $23:50$ hours and reaches Chennai at $00:40$ hours. Rewrite the statement using a $12$-hour format. Also find the duration of the flight.

Answer 1

Hint: The $12$- hour clock is a time convention in which the 24 hours of the day are divided into two periods. The two periods are ante meridiem (AM) and post meridiem (PM).

Complete step-by-step answer:
$12$- Hour format consists of two sections. Each section contains $12$ hours out of the total $24$ hours of the day.
Time is told using the $12$ hours from midnight to midday (the morning or AM hours), and the $12$hours from midday to midnight (afternoon and night or the PM hours).
Aeroplane leaves Bengaluru at $23:50$ hours ($24$- hour format)
We will convert it in $12$- hour format by subtracting $12$from it and we will add the PM after it as it is night time.
So,
$
  23:50-12 \\
 =11:50PM \;
$
Therefore, in a $12$- hour format aeroplane leaves Benagluru at $11:50$ PM.
Aeroplane reaches Chennai at $00:40$ hours ($24$- hour format)
To convert it into a $12$- hour format add AM after $00:40$because it is midnight.
Therefore, Aeroplane reaches Chennai at $00:40$ AM.
Duration of the flight:
$00:40-23:50$
As we can see that start minutes are greater than the end minutes we will subtract 1 hour from the end time hours and 60 minutes to the end minutes.
End time now can be written as,$23:100$ only for the calculation of the duration of the flight.
Calculate:
$23:100-23:50$
=$50$ minutes
Hence, the duration of the flight is $50$ minutes.
So, the correct answer is “50 Minutes”.

Note: The 24 - hour clock is the convention of timekeeping in which the day runs from midnight to midnight and is divided into hours. This is indicated by the hours passed since midnight and is popularly referred to in the United States. Don’t forget to convert in a twelve hour format before doing calculations.