Ajeet works 4 times as fast as Sohan. If Sohan can complete a work in 20 days independently, the number of days in which Ajeet and Sohan can together finish the work is:

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SSC CGL 2023 Tier-I Official Paper (Held On: 21 Jul 2023 Shift 4)
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Answer (Detailed Solution Below)

Option 3 : 4
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Detailed Solution

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Given: 

Ajeet works 4 times as fast as Sohan. If Sohan can complete a work in 20 days independently

Concept used:

Efficiency = (Total work / Total time taken)

Efficiency = work done in a single day 

Calculation:

Efficiency ratio of Ajeet : Sohan = 4 : 1

So time ratio will be 1 : 4

So Ajeet takes it 20/4 = 5days

Together does in 1 day,

⇒1/5 + 1/20 = 1/4 part

Then Ajeet and Sohan can together finish the work in 4 days

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