Question

A and B together can do a work
in 12 days. A alone can do this in 20 days
and if B works half a day then in
how many days A and B together
can complete the work?​

Answer 1

Answer:

15 days

Step-by-step explanation:

B alone can do the work in 1/12 - 1/20 = 5 - 3/60 = 1/30

=> 30 days ( if he works full days).

Since B works half a day, then B will take 30 * 2 = 60 days.

So A&B together will take 1/20 + 1/60 = 4/60 = 1/15

     = 15 days.