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Ram can do a piece of work in 6 days. Shyam is 20% more efficient than Ram. If Hari also works with Ram and Shyam then together they finish the work in 2 days. In how many days will Hari finish the work alone?

Ram can do a piece of work in 6 days. Shyam is 20% more efficient than Ram. If Hari also works with Ram and Shyam then together they finish the work in 2 days. In how many days will Hari finish the work alone? Correct Answer 7.5

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