Question

A can do a piece of work in 15 days while B can do it in 10 days. How long will they take together to do it? ​

Answer 1

work done by A in 15 days= 1

1 day= 1/15

work done by B in 10 days=1

1 day= 1/10

Let x be the number of days

(1/15 + 1/10)x= 1

(2x+3x)/30= 1

5x= 30

x= 30/5= 6

they will take 6 days to complete a work together.