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Time, Work, Speed

A completes a...

Question

A completes a work in 10 days while B completes in 20 days. When they work together they complete the work in =__ (upto 2 decimal places).

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Solution

$T i m e n e e d e d t o c o m p l e t e t h e w o r k t o g e t h e r = \frac{a b}{a + b}$

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