A and B can do a job together in 25 days. After 15 days of working together, B leaves. liete completes the remaining part of the job in 20 days, how long would each take to complete the job, working separately?
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A can do a work in=15 days.
B can do the same work in = 20 days.
So in 1- day both can do=1/15 +1/20 =7/60 the work.
In 4- days both can do=(7/60) x 4 =7/15 the work.
The portion of work left unfinished = (1–7/15)= 8/15
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