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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
Similar Questions :

1. 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

2. A does a work in 10 days and B does the same work in 15 days. In how many days they together will do the same work ?

  • 5 days
  • 6 days
  • 7 days
  • 8 days

3. A alone can complete a work in 16 days and B alone can do in 12 days. Starting with A, they work on alternate days. The total work will be completed in

  • \begin{aligned} 13\frac{1}{4} \end{aligned}
  • \begin{aligned} 13\frac{1}{2} \end{aligned}
  • \begin{aligned} 13\frac{3}{4} \end{aligned}
  • \begin{aligned} 13\frac{4}{4} \end{aligned}

4. A is twice as good as workman as B and together they finish a piece of work in 18 days. In how many days will B alone finish the work.

  • 27 days
  • 54 days
  • 56 days
  • 68 days

5. 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}
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  • sindhu 9 years ago

    could anyone explain 5th question more clearly

  • Anirban Majumder 10 years ago

    {K/(K-1)}* LESS DAYS
    {3/(3-1)*10}
    (3/2)*10
    3*5
    15DAYS

  • Anirban Majumder 10 years ago

    short cut :-

    times less/ (K-1) where K is efficiency

    therefore 10/ (3-1)

    =5 hence A takes 5 days to do the work {& which is 10 days less than that of B}

    so B takes 10+5 = 15 days

  • manasa 11 years ago

    could you please explain this prob.

    mastguru 11 years ago replied

    Hello Manasa,

    In this type question where working capacity is given and we need to calculate the time.

    If you do certain work faster than me, then you will take less time than me, right !

    Now A is three times better workman than B.

    So, the work which B will do in 3 days, A will do in 1 day.

    So Ratio of time is 1:3

    If difference of time is 2 days, B takes 3 days (Please note from ratio 3 - 1 = 2)

    If difference of time is 10 days, B takes (3/2) * 10 =15 days.

    Thanks