Question

A and b, working alone, can do a piece of work in 40 days and 60 days respectively. In how many days can they complete the work if they are working together?

Answer 1

Step-by-step explanation:

B's work per day = 1/60 of a whole work.

Working for 15 days: A = 15/40 of total job done.

B = 15/60 of total job done.

Together after 15 days,

= (15/40 = 3/8) + (15/60 = 3/12) = 9/24 + 6/24 = 15/24

= 5/8 is the Answer