1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Mow a lawn Puzzle | 28 Jun 2009

Discussion in '$1 Daily Competition' started by shabbir, Jun 28, 2009.

  1. shabbir

    shabbir Administrator Staff Member

    Joined:
    Jul 12, 2004
    Messages:
    15,283
    Likes Received:
    364
    Trophy Points:
    83
    "A" can mow a lawn in 2 hours while "B" can do so in 2.5 hours separately. If A & B work together, how long will it take for them to mow the lawn?
     
  2. mayjune

    mayjune New Member

    Joined:
    Jun 14, 2009
    Messages:
    817
    Likes Received:
    33
    Trophy Points:
    0
    Occupation:
    Student
    Location:
    Pune,Delhi
    Ans is 1.112 hours (aprox)

    Lets say the lawn is 1000 sq mts
    A takes 1000/120 mins i.e. in one min = 8.334 mts
    B takes 1000/150 mins i.e. in one min = 6.667 mts
    Total time = x
    6.66x + 8.33x = 1000
    x = 66.67 (aprox)
    Therefore 1.112 hours (aprox)
     
  3. shabbir

    shabbir Administrator Staff Member

    Joined:
    Jul 12, 2004
    Messages:
    15,283
    Likes Received:
    364
    Trophy Points:
    83
    In 1 hour, A can mow 1/2 the lawn.
    In 1 hour, B can mow 2/5 of the lawn.
    Together in 1 hour, they can mow 1/2 + 2/5 = 9/10 of the lawn.
    So to complete the lawn mowing, it will take them 10/9 hours.

    Its rare we have a Winner before a post from Saswat :D
     
  4. SaswatPadhi

    SaswatPadhi ~ Б0ЯИ Τ0 С0δЭ ~

    Joined:
    May 5, 2009
    Messages:
    1,343
    Likes Received:
    55
    Trophy Points:
    0
    Occupation:
    STUDENT !
    Location:
    Orissa, INDIA
    Home Page:
    Actually, I have already reached the limit : 3 wins/week. So I was not actually waiting for Today's puzzle. ;)

    Congrats mayjune.
     
  5. mayjune

    mayjune New Member

    Joined:
    Jun 14, 2009
    Messages:
    817
    Likes Received:
    33
    Trophy Points:
    0
    Occupation:
    Student
    Location:
    Pune,Delhi
    donate my 1$ to the open source please...
     
  6. shabbir

    shabbir Administrator Staff Member

    Joined:
    Jul 12, 2004
    Messages:
    15,283
    Likes Received:
    364
    Trophy Points:
    83
    Will do that. And as always if you have any open source projects please do let me know.
     
  7. mayjune

    mayjune New Member

    Joined:
    Jun 14, 2009
    Messages:
    817
    Likes Received:
    33
    Trophy Points:
    0
    Occupation:
    Student
    Location:
    Pune,Delhi
    will do...
     

Share This Page