Question

A, B, C ,can do a piace of work in 12, 15, 20 days respectively how long will they take to do it together.​

Answer 1

Step-by-step explanation:

Work done by A in 1 day = 1/12

__________B_______ = 1/15

__________C________= 1/20

Now,

A+B+C = 1/12 + 1/15 + 1/20

= 12/20

Hence, time taken together is 20/12 hours.