A and B together complete a work in 20 days. B alone complete the work in 30 days. Find in how many days A alone complete the work?

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RRB Clerk Prelims Memory Based Paper (Held On: 17 August 2024 Shift 4)
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  1. 50
  2. 60
  3. 40
  4. 45
  5. 72

Answer (Detailed Solution Below)

Option 2 : 60
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Detailed Solution

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Calculation

Total work =  LCM of 20 and 30 = 60

Efficiency of B is 60 /30 = 2

Total Efficiency of A and B together is 60/20 = 3

So, efficiency of A is 3 -2 = 1

So, A alone complete the work in 60 / 1 = 60 days

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