Practice Test Discussion


'A' can do piece of work in 60 days while 'B' alone can do it in 90 days. They begin together but 15 days before the completion of the work, 'B' leaves off. Find the total number of days for the work to be completed.

  • Explanation

    Here, a=60, b=90, x=15

    As per the formula,

    =(b+x)aa+b=(90+15)×6060+90=105×60150=7×6=42 days

    Hence option A is the correct.

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