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  • 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
    20 minutes
    http://www.youtube.com/watch?v=JZdEH...e_gdata_player

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    • #3
      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.

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

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        • #5
          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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