Ram and Hari can finish a piece of work in 6 days and 12 days respectively in how many days will they finish it working together ​

4 days

Explanation:

Given - Ram and Hari can finish a piece of work in 6 days and 12 days

             respectively.

To find - In how many days will they finish it working together

Proof -

As given,

Ram and Hari can finish a piece of work in 6 days and 12 days respectively.

⇒1 day work of Ram done in =

   1 day work of Hari done in =

If they work together,

1 day work of both together done in = + = =

As we know Work is inversely proportional to efficiency

And efficiency = Person's 1 day work

As we have ,

1 day work of both together done in =  

⇒ Total work done in 4 days if they work together.

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