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Pratibha is thrices as efficient as Sonia and is therefore able to finish a piece of work in 60 days less than Sonia. Pratibha and Sonia can individually complete the work respectively in
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- 30 days, 60 days
- 60 days, 90 days
- 30 days, 90 days
- 40 days, 120 days
Correct Option: C
Time taken by Sonia = 3x days (let)
∴ Time taken by Pratibha = x days
∴ 3x – x = 60 ⇒ 2x = 60
⇒ x = 30 days
∴ Time taken by Sonia
= 3x days = 3 × 30 = 90 days.
