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?

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Answer:Abdul does (1/10)th of the work in a day.

Ramesh does (1/15)th of the work in a day.

In 2 days, Abdul and Ramesh do (2/10)+(2/15) = (6/30) +(4/30) = (10/30) or (1/3)rd of the work in a day.

After 2 days the work remaining is (2/3)rd, which Abdul will do in (2/3)/(1/10) = (20/3) or 6 and 2/3rd of the 7th day.