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Worker A takes 8 hours to do a job. Worker B takes 10 hours to do a job. How long should it take both A and B, working together to do same job.

  • \begin{aligned} \frac{4}{9} \end{aligned}
  • \begin{aligned} 2\frac{4}{9} \end{aligned}
  • \begin{aligned} 3\frac{4}{9} \end{aligned}
  • \begin{aligned} 4\frac{4}{9} \end{aligned}
Similar Questions :

1. Worker A takes 8 hours to do a job. Worker B takes 10 hours to do a job. How long should it take both A and B, working together to do same job.

  • \begin{aligned} \frac{4}{9} \end{aligned}
  • \begin{aligned} 2\frac{4}{9} \end{aligned}
  • \begin{aligned} 3\frac{4}{9} \end{aligned}
  • \begin{aligned} 4\frac{4}{9} \end{aligned}

2. 4 men and 6 women finish a job in 8 days, while 3 men and 7 women finish it in 10 days. In how many days will 10 women working together finish it ?

  • 30 days
  • 40 days
  • 50 days
  • 60 days

3. 5 men and 2 boys working together can do four times as much work as a man and a boy. Working capacity of man and boy is in the ratio

  • 1:2
  • 1:3
  • 2:1
  • 2:3

4. A can finish a work in 18 days and B can do same work in half the time taken by A. then working together, what part of same work they can finish in a day

  • 1\5
  • 1\6
  • 1\7
  • 1\8

5. A is thrice as good a workman as B and takes 10 days less to do a piece of work than B takes. B alone can do the whole work in

  • 15 days
  • 10 days
  • 9 days
  • 8 days
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  • Dixit Nayak 7 years ago

    Two workers undertake to do a job. 2nd worker
    started two hours after the 1st. 5 hours after the 2nd worker
    started the work, only 11/20 work was done. In how
    many hours they can complete the work independently, if it is known that 1st
    worker did 60% of the total work and 2nd worker did the rest???

  • Shubham sanware 8 years ago

    How 1 hour work is 1/8 ?

  • Awais 10 years ago

    where is came from?? means 40/9?? and how is it done 4/4/9

    mastguru 10 years ago replied

    Hello Awais,

    as we calculated that work done by A and B in 1 hour is 9/40 hour

    It means both will finish work in 40/9 hour, here denominator becomes numerator and numerator become denominator.

    or say if You can finish a task in 8 days, it means you will finish 1/8 in 1 day, right.

    Also if you can finish 1/8 in 1 day then it means you will finish it in 8 days. so it is inverse of that.

    In same way we got 40/9 from 9/40

    also 4(4/9) = 40/9,

    As options were given in this format so we had to break it in this form.

    In this type of form,

    we calculate as,

    (4*denominator+numerator)/denominator,

    i.e. (4*9+4)/9 = 40/9

    Hope it helps.