Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie

What's the answer?

Options
  • 04-08-2013 5:42pm
    #1
    forumlover
    Registered Users Posts: 40 ✭


    A car travels 2 miles.

    It does the 1st mile at exactly 30mph.

    What speed does it travel at to get an average speed of 60mph over the 2 miles?


Comments

  • Options
    #2
    jamesbondings
    Registered Users Posts: 2,201 ✭✭✭jamesbondings


    90mph??


  • Options
    #3
    forumlover
    Registered Users Posts: 40 ✭forumlover


    Wrong


  • Options
    #4
    jamesbondings
    Registered Users Posts: 2,201 ✭✭✭jamesbondings


    no idea, pm me the answer will ya??


  • Options
    #5
    Ten of Swords
    Moderators, Category Moderators, Social & Fun Moderators, Society & Culture Moderators Posts: 23,280 CMod ✭✭✭✭Ten of Swords


    By travelling the first mile at 30mph it is impossible to achieve average speed of 60mph over 2 miles. It cannot be done.

    T=time, D=distance, S=speed (T=D/S)

    Time required for average speed over 2 miles @60mph: (D=2,S=60) therefore T=2/60 -> 1/30 of 1 hour... 2 minutes

    Time taken travelling the first mile @30mph : (D=1,S=30) therefore T=1/30 of 1 hour as above... 2 minutes

    There is simply 0 time left in order to achieve an average speed of 60mph, even travelling at the speed of light would not be fast enough.

    Moderator: Lesbian, Gay, Bisexual & Transgender, Vegan & Vegetarian

    Category Moderator: Social & Fun



Advertisement