Results 1 to 8 of 8

Thread: Tanking up

  1. #1
    Platinum Lounger
    Join Date
    Nov 2001
    Location
    Melbourne, Victoria, Australia
    Posts
    5,016
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Tanking up

    An operator knows that he can fill a tank, using the small hose, in 45 minutes. Using the large hose takes 30 minutes. How long will it take to fill the tank using both hoses at the same time?

    Alan

  2. #2
    Plutonium Lounger
    Join Date
    Mar 2002
    Posts
    84,353
    Thanks
    0
    Thanked 29 Times in 29 Posts

    Re: Tanking up

    <span style="background-color: #FFFF00; color: #000000; font-weight: bold"><font color=yellow>18 minutes (1/45 + 1/30 = 1/18)</font color=yellow></span hi>

  3. #3
    5 Star Lounger Ruff_Hi's Avatar
    Join Date
    Feb 2001
    Location
    New York, New York, USA
    Posts
    768
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Re: Tanking up

    answer without thinking is <span style="background-color: #FFFF00; color: #000000; font-weight: bold"><font color=yellow> 75 minutes </font color=yellow></span hi>. Answer with thinking is <span style="background-color: #FFFF00; color: #000000; font-weight: bold"><font color=yellow> 18 minutes </font color=yellow></span hi>
    (Location Australia, then UK, but now USA. Heart, outlook, attitude, etc always Australian)
    Quote: "All Happiness is the release of internal pressure"

  4. #4
    WS Lounge VIP sdckapr's Avatar
    Join Date
    Jul 2002
    Location
    Pittsburgh, Pennsylvania, USA
    Posts
    11,225
    Thanks
    14
    Thanked 342 Times in 335 Posts

    Re: Tanking up

    The other common answer with a little thinking is to just average them (30 + 45)/2 = 37.5 min.

    Steve

  5. #5
    Bronze Lounger
    Join Date
    Feb 2001
    Posts
    1,424
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Re: Tanking up

    <P ID="edit" class=small>(Edited by skitterbug on 20-Jul-04 15:59. Added to the post! )</P>Wait a minute! <span style="background-color: #FFFF00; color: #000000; font-weight: bold"><font color=yellow> How big is the tank? Or is that something everyone is suppose to know?? Showing my ignorance, maybe.....</font color=yellow></span hi>

    Oh duh, I guess it doesn't matter how much it holds since we know it will be filled in such and such a time! Now I know why I flunked math!


    "Peace begins with a smile. "-- Mother Teresa

  6. #6
    5 Star Lounger Ruff_Hi's Avatar
    Join Date
    Feb 2001
    Location
    New York, New York, USA
    Posts
    768
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Re: Tanking up

    Oops - I forgot to mention that the tank (when full) holds twice half its maximum carrying capacity. Silly me.
    (Location Australia, then UK, but now USA. Heart, outlook, attitude, etc always Australian)
    Quote: "All Happiness is the release of internal pressure"

  7. #7
    Platinum Lounger
    Join Date
    Nov 2001
    Location
    Melbourne, Victoria, Australia
    Posts
    5,016
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Re: Tanking up

    I did the calculation based on half twice its maximum carrying capacity... strange - same answer.

    Alan

  8. #8
    4 Star Lounger
    Join Date
    Aug 2002
    Location
    Dallas, Texas, USA
    Posts
    594
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Re: Tanking up

    <span style="background-color: #FFFF00; color: #000000; font-weight: bold"><font color=yellow>It's not the size of the tank that matters, but the size of the connection supplying the hose. 18 minutes is the theoretical maximum. If the big hose already meets the maximum capacity of the 'supply', then the answer would be 30 minutes...because running both hoses wouldn't make the supply any faster.</font color=yellow></span hi>

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •