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Chin and Chan together can complete a piece of work in 40 days while Chin alone can complete the same work in 60 days. Chan alone will be able to complete the same work in
1. 90 days
2. 120 days
3. 60 days
4. 75 days

1 Answer

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Best answer
Correct Answer - Option 2 : 120 days

Given

Chin and Chan together can complete a piece of work in 40 days while Chin alone can complete the same work in 60 days

Concept used

Work  efficiency 

Calculation

Chin and Chan do work together = 40 days 

⇒ 1 day work of Chin and Chan  = 1/40 

⇒ Chin can do same work = 60 days

⇒ 1 day work of Chin = 1/60

According to question

⇒ 1 day work of Chan = 1/40 - 1/60

⇒ (3 - 2)/120 = 1/ 120

∴ Chan can do the same work along in 120 days

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