Question

13) A can do a job in 12 days while B can do the same job in 15 days. How many
days are required to complete the job if the start working together?
11 7 days 2)5 days 3) 6 days 4) 4 days​

Answer 1

Answer:

6 days................

Answer 2

$hi \: mate \: \\ here \: is \: your \: answer$

A does a job in 12 days

So in 1 day A does = 1/12 of the job

Similarly B does the job in 15 days

So in one day B does = 1/15 of the job

Hence

(A + B) together do = 1/12 + 1/15 = 5 + 4/60 = 9/60 = 3/20

Thus they finish the job in 20/3 = 6 2/3 days