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Ravi and Kamal together can complete a task in 60 days, they start work together and after 46 days Kamal left the task and whole task completes in 66 days. Find the days in which Kamal alone can complete 60% of whole task? 
1. 200 days
2. 360/7 days
3. 600/7 days
4. 120 days

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Correct Answer - Option 4 : 120 days

Given:

Ravi and Kamal together can complete the task in = 60 days 

Kamal left the work after = 46 days

The whole task completes in = 66 days

Formula used:

Work = Time × efficiency 

Calculation:

Ravi and Kamal both work together = 46 days

⇒ The remaining task of Kamal of 14 days, completed by Ravi in = 66- 60= 6 days 

⇒ The efficiency ratio ok Kamal & Ravi = 6/14= 3/7

⇒ Total task= (3 + 7) × 60 = 600

⇒ 60% of Total  task = 360

⇒ Time taken by Kamal alone to complete the 60% of whole task = 360/3 = 120 days

∴ Kamal can complete the 60% of whole task in 120 days. 

 

 

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