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    Question

    Raj, Sanjay and Vaibhav can separately finish a work in

    20, 30 and 40 days, respectively. In how many days Raj can finish the work if he is assisted.by Sanjay and Vaibhav and alternates days starting with Sanjay.
    A 23/5days Correct Answer Incorrect Answer
    B 63/5days Correct Answer Incorrect Answer
    C 41/5days Correct Answer Incorrect Answer
    D 23/7days Correct Answer Incorrect Answer
    E none of these Correct Answer Incorrect Answer

    Solution

    RajSanjayVaibhav 203040 120 643 Working type – (Raj+ Sanjay) (Raj +Vaibhav) Working in first 2 days =10+9=19unit Working in 2×6=12 days =19×6=114unit 13days-6/10=3/5 Total time =12+3/5=63/5days

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