Time and Work Practice Test 4 with solutions

Question : 13 of 40

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Preeti and Gauri can do a work in 20 and 30 days respectively. In how many days can they finish the same work if they work together?

Solution:

Work done by Preeti in one day =

1/{20}

Work done by Gauri in one day =

1/{30}

Work done by Preeti and Gauri in one day
=

1/{20}+1/{30}

{3+2}/{60}

5/{60}

1/{12}

So, the time taken by both together to finish the work = 12 days.

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