Math Word Problem Riddle!?

Joe and John have the same car. It takes 2 hrs for John to paint his car, and it takes joe 3 hrs to paint his car. How long would it take for them to paint one car together? Can u also show me how you figure it out?

Update:

and i have another one........ John can type a paper in 50 min. John and JOE can type a paper togther in 30 min. How long does it take JOE to type a paper by himself........ how do you do this one?

2 Answers

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  • iceman
    Lv 7
    8 years ago
    Favorite Answer

    1/2 + 1/3 = 1/t

    5/6 = 1/t

    t = 6/5 hr

    Re: Additional details:

    let x = the time it take JOE to type a paper by himself in minutes

    1/50 + 1/x = 1/30

    1/x = 1/30 - 1/50

    1/x = (5 - 3)/150

    1/x = 2/150

    x = 75 minutes

    Regards.

  • 8 years ago

    1/2+1/3=1/x

    3/6+2/6=1/x

    5/6=1/x

    5x=6

    x=6/5

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