Tuesday, March 20, 2007

"MATH PROBLEM OF THE DAY"

If Robert can assemble a model car in 30 minutes and Craig can assemble the same model car in 20
minutes, how long would it take them, working together, to assemble the model car?
(A) 12 minutes
(B) 13 minutes
(C) 14 minutes
(D) 15 minutes
(E) 16 minutes
at

5 comments:

  1. AnonymousMarch 21, 2007 at 3:04 AM

    30 x 20/ 30+20

    600/50
    12 MINUTES

    ANSWER : A

    ReplyDelete
  2. MadhurMarch 21, 2007 at 10:09 AM

    A

    ReplyDelete
  3. Dr Kranthi RajMarch 21, 2007 at 2:04 PM

    12 minutes

    ReplyDelete
  4. JigarMarch 22, 2007 at 4:05 AM

    12 minutes

    ReplyDelete
  5. AnonymousMarch 22, 2007 at 8:08 AM

    let the work done(that is to assemble a model car) by both of them be W
    therefore
    the rate is
    W/30 +W/20
    => 5W/60
    => w/12 minutes

    ReplyDelete