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Home Aptitude Time and Work See What Others Are Saying!
  • Question
  • A and B can do a piece of work separately in 8 and 12 h. If they work alternate hours, A starting, when will the work be finished?


  • Options
  • A. 91/2 h
  • B. 9 h
  • C. 81/2 h
  • D. 8 h

  • Correct Answer
  • 91/2 h 

    Explanation

    (A + B +)'s 2 h work = 1/8 + 1/12 = 5/24
    (A + B)'s 8 h work = (5 x 8)/(24 x 2) = 5/6
    Work done by A in 9th h = 1/8
    Total work done upto 9th h = 5/6 + 1/8 = 23/24
    Remaining wok = 1/24
    B's 1 h work = 1/12
    B can do 1/24 of the work = (1/24) x 12 = 1/2 h
    So, both can finish the job in 91/2 h.


  • More questions

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    • Options
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    • B. Tea: Beverage
    • C. Sniff: Inhale
    • D. Water: Sip
    • Discuss
    • 2. In the following question, select the related word pair from the given alternatives. Gun : Soldier : : ? : ?

    • Options
    • A. Pen : Carpenter
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    • C. Chisel : Sculptor
    • D. Sword : Doctor
    • Discuss
    • 3. Fumble is to Finesse as Malign is to

    • Options
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    • 4. The following question consist of two words that have a certain relationship to each other, followed by four alternatives. Select the best alternative that has the same relationship as the original pair of words Evaporation: Cloud

    • Options
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    • Discuss
    • 5. Select the related word/letters/numbers from the given alternatives: Length:Meter::Power:?

    • Options
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    • 6. 6 : 18 :: 4 : ?

    • Options
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    • 7. The following question consist of two words that have a certain relationship to each other, followed by four alternatives. Select the best alternative that has the same relationship as the original pair of words Cream: Cosmetics

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    • Discuss
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    • Options
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    • Discuss
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    • Options
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    • Discuss
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    • Options
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