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.

Answer 1

If Pooja takes x days, then Aarti takes 2x days. So,
x = 2x-90
x = 90
Now, if they take n days together, then
1/90 + 1/180 = 1/n
Solve for n

Answer 2

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