Monday, November 19, 2007

GRE GEOMETRY QUESTION OF THE DAY

P,Q and S are running a race on a circular track of circumference of 2100 m. When P completes one round, Q is 700m behind him. When S completes one round, Q is 300m ahead of him. What is the minimum distance from the starting point when they are together again?

A) 300m
B) 700m
C) 2100m
D) 16800m
E) None of these

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13 comments:

  1. shivaniNovember 22, 2007 at 1:05 AM

    d

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  2. AnonymousNovember 27, 2007 at 10:24 AM

    i think it E

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  3. FredNovember 27, 2007 at 9:57 PM

    I think it's E as well... they have to meet back at the beginning of the track, i.e. the minimum distance from start = 0. Q and P don't meet until P goes around the track 3 times and ends up back at the beginning. Q and S don't meet until S goes around the track 7 times and ends up back at the beginning. If all three ended up meeting again, they would have to be at the beginning.

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  4. Dhanunjaya GundalaNovember 30, 2007 at 9:46 AM

    Answer is D.

    L.C.M of 21, 14, 24 - 168

    Ans -D - 16800

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  5. CoolDecember 1, 2007 at 9:07 PM

    Ithink its E

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  6. UnknownDecember 2, 2007 at 5:59 AM

    I think its E .......

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  7. UnknownDecember 2, 2007 at 5:59 AM

    I think its E .......

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  8. FredDecember 5, 2007 at 7:45 PM

    It can't be D because it's asking for minimum distance from starting point. Circumference is 2100, and 16800>2100. Maximum possible distance from starting point is 1050 (it's a circle track).

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  9. AnonymousDecember 27, 2007 at 9:21 AM

    the ans is e.

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  10. AnonymousDecember 31, 2007 at 6:18 AM

    it shoud be E... coz... it shoud be the LCM of 21,14 n 11.... nne of the option has this as an answer..

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  11. UnknownJanuary 9, 2008 at 10:08 PM

    E

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  12. AnonymousMay 14, 2008 at 12:32 AM

    the answer is d)
    the ratio of the speeds of p and q is 3:2 and the ratio of speeds of q and s is 8:7 .. we jus wanna combine these two ratios,,, it ll be 12: 8 : 7.. we have to take the lcm of these values.. tht is 168... therefore the answer is 16800

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  13. Ashik ChOctober 7, 2008 at 11:58 PM

    ^ anonymous,that was nice description

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