Question

A can do a work in 20 days the same work has done by b in 30 days.. Hiw long will they take to do the work together

Answer 1

Answer:

here your answer

12 days

Step-by-step explanation:

we know that

x can do a work in n days then

x per day work is 1/n days.

ATQ

A can do a work in 20 days.

A can do per day work is 1/20

similarly B per day work is 1/30

per day together can do the work is

1/20+1/30

(3+2) /60

5/60

1/12

so together can do per day work is 1/12

total work completed by them is 12 days.