Heera, Moti and Panna can do a piece of work in 15days, 10 days and 6 days respectively. How long will they take to complete the j

Heera, Moti and Panna can do a piece of work in 15days, 10 days and 6 days respectively. How long will they take to complete the job if they all work together?

About the author
Evelyn