00:01
Now, in this problem, we are given that audrey takes 40 minutes to invite people for the party and her mother takes about 1 hour to invite the same number of people.
00:20
1 hour means 60 minutes.
00:24
Now, we need to find how long would it take for them to address the invitation together.
00:31
Now, if we write the rate of work for audrey, this will be 1 over 40.
00:39
This is invitation per minute and the rate of work for mother, this would be 1 over 60, invitations per minute.
00:52
Now, they both took t amount of time to invite the people together.
00:58
So, what we can write, the fractional part of the job done by audrey plus the fractional part of the job done by mother, this should be equals to 1 whole job.
01:10
So, what i can write, 1 over 40 plus 1 over 60 times t.
01:17
This is the 1 job work.
01:19
It should be equals to 1, the whole job...