The record will play for a total of 5/12 of an hour, which can also be expressed as 25 minutes. Here's how to go about figuring that out.
When you have to add fractions with different denominators, you have to convert them so they have the same denominator. In this case, you can convert 1/3 to have 12 as its denominator. You do this by multiplying it by 4. When you do that, you get 4/12.
Since the record has played 4/12 hours and has 1/12 left to go, it will play for 5/12 total.
To convert this into minutes, you must know that one hour = 60 minutes. So then you must figure out how many minutes make up 1/12 of an hour. Divide 60/12, that gives you 5.
So 1/12 hour = 5 minutes. Therefore 5/12 hours = 25 minutes.
First, Bean123, convert each of the times into minutes. With 60 minutes in an hour, 1/3 of an hour is 20 minutes and 1/12 of an hour is 5 minutes. So, the record is 25 minutes long.
Now, you can use what you just did to convert that back to a fraction. If 5 minutes is 1/12, then 25 minutes is 5 * 1/12 or 5/12.
You could also just write the part/whole fraction: 25 minues/60 minutes, which can be reduced (dividing by 5) to get 5/12.
ANSWER: The record is 5/12 hour long (25 minutes).
The full duration of the play of the record
= time lready played +time remained to play
=1/3 hour+1/12 hour .Take the LCM of the denominators and convert each fraction into equivalent fractions:
=(5/12)60 minutes, as 1hour =60 minutes.
Time the record has been playing = t1 = 1/12 hours
Time the record still has to play = t2 = 1/3 hours
Total playing time of record = T is given by the formula:
T = t1 + t2
Substituting given values of t1 and t2 in the above formula we get:
T = 1/3 + 1/12
= (1*4 * 1)/12 = 5/12 hours
We can convert the time of 5/12 hours in time in minutes by multiplying it by 60.
Total playing time of record in minutes = (5/12)*60 = 25 minutes.
The total time the record will play = 5/12 hour, or 25 minutes
`1/3` hour the record still has `1/12`
`1/3xx4= 4/12 `
`4/12 + 1/12 = 5/12 `
`60 -: 12 = 5 xx5 = 25 `
the record is 25 minutes long