P alone can do a piece of work in 24 days. Q alone can do it in 30 days and R alone can do it in 20 days. In how many days they can complete it together? 

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SSC MTS (2022) Official Paper (Held On: 09 May 2023 Shift 3)
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  1. 15 days
  2. 18 days
  3. 8 days
  4. 10 days

Answer (Detailed Solution Below)

Option 3 : 8 days
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Detailed Solution

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Given:

Time taken by P alone = 24 days

Time taken by Q alone = 30 days

Time taken by R alone = 20 days

Formula Used:

Combined one-day work = Sum of each person's one-day work

Total time to complete the work = 1/Combined one-day work

Calculation:

Combined work of P, Q, R = 1/24 + 1/30 + 1/20 = (5 + 4 + 6)/120 = 15/120 = 1/8

So, Total required time = 1/(1/8) = 8 Days

∴ P, Q, and R together can complete the work in 8 days.

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