Question

three men A B C, can do a piece of work in 9 hr ,18 hr and 12hr respectively .how long will they if they work together.
here the answer should be 4.
please help​

Answer 1

Answer:

4day

Step-by-step explanation:

A can do a piece of work in one day=1/9work

B can do a piece of work in one day =1/18work

aC can do a piece of work in one day =1/12work

They work together =(A+B+C)

= (1/9+1/18+1/12)work

= 1/4work

1/4work in one day = 1

work in one day = 1/1/4

1/1×4

4day

Answer 2

Answer:

the correct answer is 4 mate