In How much Time All the Three Finish Work?

Three person A, B and C can do a piece of work in 15 days, 6 days and 10 days respectively. In how many days will all the three finish 3 times the similar work?

  1. 3 days
  2. 9 days
  3. 6 days
  4. 4 days

 

Monis Rasool Professor Asked on 23rd May 2015 in Maths.
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  • 1 Answer(s)

    Answer: (b) 9 days
    Explanation:-

    A person can do a piece of work in 15 days.
    Therefore A person can do work in a day = 1/15

    B person can do same work in 6 days.
    Therefore B person can do work in a day = 1/6

    C person can do same work in 10 days.
    Therefore c person can do work in a day = 1/10

    All together can do work = 1/15 + 1/6 + 1/10 = 10/30
    = 1/3

    Hence, the altogether can do piece of work in 3 days.
    All together can do three times of work = 3 x 3 = 9 days.

    Anurag Mishra Professor Answered on 23rd May 2015.
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