Question

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

Thank you