New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    Person A can finish a task alone in 22(3/5) days, while

    Person B can complete the same task alone in 14(1/8) days. If A and B collaborate on the task, how many days will it take for them to finish it together?
    A 10(9/13) days Correct Answer Incorrect Answer
    B 8(9/13) days Correct Answer Incorrect Answer
    C 8(6/11) days Correct Answer Incorrect Answer
    D 9(9/10) days Correct Answer Incorrect Answer

    Solution

    22(3/5) = 113/5 14(1/8) = 113/8 Let total work = 1 unit So, efficiency of 'A' = (5/113) units/day Efficiency of 'B' = (8/113) units/day So, combined efficiency of 'A' and 'B 5/113 + 8/113 = 13/113 units/day So, time taken by 'A' and 'B' together to finish the work = (113/13) = 8(9/13) days

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