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Pairwise together times: time for all three together

This type of question, asked 2 times: CDS 2 2023, CDS 2 2024. All 2 questions below, oldest first.

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  1. Question 1

    CDS 2 2023

    4
    If A and B can finish a work in 10 days, B and C can finish the same work in 12 days, C and A can finish the same work in 15 days; then in how many days can A, B and C together finish half of the work ?

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  2. Question 2

    CDS 2 2024

    62
    A question is given followed by two statements I and II. Consider the Question and the Statements and mark the correct option. Question : In how many days can AA, BB and CC together finish the work ? Statement-I : AA and BB together can finish the work in 24 days Statement-II : BB and CC together can finish the work in 36 days Which one of the following is correct in respect of the above Question and the Statements ?

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