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RRB NTPC 2021 · Question 72 of 131

Jaya and Hema can clean an apartment in 30 days. Hema and Sushma can do the same task in 40 days, while Jaya and Sushma take 60 days to do it. How many days will it take all three of them to work together to clean the apartment?

  1. A15(2/3)
  2. B2/3
  3. C6(2/3)
  4. D26(2/3)Correct

Answer: D. 26(2/3)

Explanation

Total Efficiency of Jaya Hema and Sushma – 2(Jaya +Hema +Sushma) =4+3+2=9 (Jaya +Hema +Sushma) =9/2=4.5 And now together to clean the apartment=120/4.5 =1200/45=80/3 = 26(2/3) days.

Source: RRB NTPC 2021 CBT 1 Previous Year Paper (3 Feb) — ixambee compilation with answer key · reliable-secondary

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