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Thread: math question

  1. #1
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    Default math question

    How do u solve this math question.
    Mike can wash a fire truck in 30 mins. Mike and tom can wash a truck in 20 minutes. How long does it take tom to wash.the.truck alone?


  2. #2
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    20 minutes

  3. #3
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    Quote Originally Posted by USAFfiredog View Post
    How do u solve this math question.
    Mike can wash a fire truck in 30 mins. Mike and tom can wash a truck in 20 minutes. How long does it take tom to wash.the.truck alone?
    The answer is that Tom takes 60 minutes to wash the truck alone.

    Method:

    Mike can wash 1 truck in 30 minutes. From this we can determine that in the 20 minutes he is washing the truck with Tom, Mike will have washed 2/3 of the truck himself (1 truck in 30 minutes = 1/3 of the truck every 10 minutes).

    If Mike washes 2/3 of the truck in 20 minutes, and he and Tom finish at the same time, then Tom will have had to wash the remaining 1/3 in the same 20 minutes.

    If Tom can wash 1/3 of the truck in 20 minutes then he will need 60 minutes to wash the whole thing.

  4. #4
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    yea nice question btw.. i also calculated it 60 minutes as i am good in maths
    Last edited by technotech; 09-08-2010 at 02:23 PM.

  5. #5
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    I struggled with math (and a bunch of other topics for the written test). The best book I found was Lepore's book Smoke Your Firefighter Written Exam. He teaches how to work out every type of math scenario you could ever see. I no longer worrk about written tests....

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