Question

A ,b and c can do a piece of work in 8 days ,12 days and 15 days respectively.how long will they take to finish the work if they work together

Answer 1

Answer:

A can do a piece of work in 8 days.

so, A can do in 1 day 1/8 part of work.

B can bo a piece of work in 12 days

So, B can do in 1 day 1/12 part of work.

C can do a piece of work in 15 days

So, C can do a piece of work in 1/15 part

Now if they working together then,

they can finish 1/8 + 1/12 + 1/15= 33/120 part of work.

So they can finish together 1 of work in 120/33 days= 3 days and 15hrs appx.