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Pooja is twice as efficient as Aarti and takes 90 days less than Aarti to complete the job. Find the time in which they can finish the job together?
1. 30 days
2. 45 days
3. 60 days
4. 90 days

1 Answer

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Best answer
Correct Answer - Option 3 : 60 days

Given

Pooja is twice as efficient as Aarti and takes 90 days less than Aarti to complete the job. 

Concept used

Time and work

Calculation

Total work = Number of days × Efficiency

Efficiency of Pooja and Aarti = 2 : 1

Pooja takes 90 days less than Aarti

⇒ 2(90 - x) = 1x

⇒ 180 - 2x = x

⇒ x = 60

Total work = 60 × (2 + 1) = 180 units

Together they can do the work in 

⇒ 180 / 3 = 60 Days.

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