Question

$4.15pm$ in $12hr$ system can be written as ……… in a $24hr$ clock system.
$\begin{align}
  & A.11hrs-45\min \\
 & B.4hrs-15\min \\
 & C.22hrs-15\min \\
 & D.16hrs-15\min \\
\end{align}$

Answer 1

Hint: First of all find the value of four o’clock in the twelve hour system. Then convert it into a twenty four hour system. Then add the fifteen minutes to both of this. This will be the same in the twenty four hour system also. This will help you in answering this question.


Complete step by step answer:
The twenty four-hour clock can be generally referred to as military time in the United States and some other countries. It is the convention of time in which the day runs from midnight to midnight and can be divided into twenty four hours. This is represented by the hours passed since midnight, from zero to twenty three. The twelve hour clock is a time convention in which the twenty four hours of the day are parted into two periods of time. That is, a.m. and p.m.
Therefore,
$4.00pm$ in $12hr$system can be shown in $24hr$ system as,
$16:00hr$
Therefore, the time $4.15pm$ in $12hr$ system can be shown $24hr$ system as,
$16hr\text{ }15\min $
This has been shown as option D in the question.

Note:
The twelve hour clock runs from $1am$ to $12$ noon and then from $1pm$ to $12$ midnight. The twenty four hour clock can use the numbers from $00:00$ to $23:59$. This midnight will be given as $00:00$. They will move onto reading the time to the quarter hour and then the closest five minutes. A time of day should be written in the twenty four hour notation in the form hour then minutes after the seconds. This format has been used worldwide in order to calculate the time. The twelve hour clock is preferred in some countries than the twenty four hour clock.