Answer
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Hint: First convert the given minutes in hours and minutes by breaking it in $\left( {60 + x} \right)$ terms.
There are 60 minutes in 1 hour, therefore when the minutes are more than 60 then subtract 60 from the minute and increase 1 hour. After that add the time to the given time.
Complete step-by-step answer:
It is given that the Mathematics lesson starts at $11:05$ and the lesson lasts for 75 minutes.
First, make a conversion of $75$ minutes in hours by breaking it in hours and minutes. We know that $75$ minutes can be broken as $60$ minutes and $15$ minutes. That is,
$75{\text{ minutes}} = 60{\text{minutes}} + 15{\text{minutes}}$
We know that $60$ minutes is equal to one hour, then $75$ minutes can be given as:
$75{\text{ minutes}} = 1{\text{ hour }}15{\text{ minutes}}$
So, 75 minutes can be expressed in terms of hours and minutes as:
1 hour and 15 minutes
Now, first add hours in the time when the Mathematics class are started, so add $1{\text{ hour}}$in the given time$11:05$. So the addition is given as:
$11:05 + 1{\text{ hour}} = 12:05$.
Now, add the remaining minutes in the time to get the time when the Mathematics class ends.
$12:05 + 15{\text{ minutes}} = 12:20$
Therefore, when the mathematics class lasts for $75$ min, then the classes of Mathematics ends at $12:20$.
Note: When the hours are greater than 12, it means that the time is expressed in $24$hour format, and in case of 12 hours format, we need to express the time with AM for the first 12 hours and PM for the next 12 hours.
There are 60 minutes in 1 hour, therefore when the minutes are more than 60 then subtract 60 from the minute and increase 1 hour. After that add the time to the given time.
Complete step-by-step answer:
It is given that the Mathematics lesson starts at $11:05$ and the lesson lasts for 75 minutes.
First, make a conversion of $75$ minutes in hours by breaking it in hours and minutes. We know that $75$ minutes can be broken as $60$ minutes and $15$ minutes. That is,
$75{\text{ minutes}} = 60{\text{minutes}} + 15{\text{minutes}}$
We know that $60$ minutes is equal to one hour, then $75$ minutes can be given as:
$75{\text{ minutes}} = 1{\text{ hour }}15{\text{ minutes}}$
So, 75 minutes can be expressed in terms of hours and minutes as:
1 hour and 15 minutes
Now, first add hours in the time when the Mathematics class are started, so add $1{\text{ hour}}$in the given time$11:05$. So the addition is given as:
$11:05 + 1{\text{ hour}} = 12:05$.
Now, add the remaining minutes in the time to get the time when the Mathematics class ends.
$12:05 + 15{\text{ minutes}} = 12:20$
Therefore, when the mathematics class lasts for $75$ min, then the classes of Mathematics ends at $12:20$.
Note: When the hours are greater than 12, it means that the time is expressed in $24$hour format, and in case of 12 hours format, we need to express the time with AM for the first 12 hours and PM for the next 12 hours.
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