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Sanjeev can build a wall in 20 days and ...

Sanjeev can build a wall in 20 days and Parveen can demolish the same wall in 30 days. If they work on alternate days with Sanjeev starting the job on the 1st day, then in how many days will the wall be built for the first time ?

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The correct Answer is:
58 days
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DISHA PUBLICATION-TIME AND WORK-Test Yourself
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