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Math Help - Problem

  1. #1
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    Problem

    Could someone help me with this problem? I'm totally lost.

    An experienced typist can type a brief in 6 hours. Her assistant can type the same brief in 9 hours. If they both work together for 3 hours and then the experienced typist work alone, how many hours will it take her to finish the job?

    Thanks,
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  2. #2
    Like a stone-audioslave ADARSH's Avatar
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    Quote Originally Posted by lila View Post
    Could someone help me with this problem? I'm totally lost.

    An experienced typist can type a brief in 6 hours. Her assistant can type the same brief in 9 hours. If they both work together for 3 hours and then the experienced typist work alone, how many hours will it take her to finish the job?

    Thanks,
    Expereienced typist types 1/6th work in one hour
    her assistant types 1/9th of the work in one hour
    so combined work done in 3 hours =\frac{1}{6}*3+\frac{1}{9}*3
    hence work left =1-\frac{5}{6} =1/6th of total work
    hence it takes one more hour by experienced typist...
    Last edited by ADARSH; November 6th 2008 at 05:45 AM.
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  3. #3
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    thank you so much ADARSH.
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