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Thread: Race

  1. #1
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    Race

    Three girls A, B and C run in a 100 m race. When A finishes, B is 10 m
    behind A and when B finishes C is 20 m behind B.

    All the athletes run at a constant speed. How far in metres was C from A when A finished?


  2. #2
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    Smile Re: Race

    Here is the answer.....

    Distance between C and A is 28 meter.

    ----------------------------
    suresh.


  3. #3
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    Re: Race

    That is the right answer. Give us your solution


  4. #4
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    Smile Re: Race

    Let us assume A's average speed is 2m per second...

    So A covered the distance in 20 sec...

    B travelled the distance in 20 seconds is (100 - 10) = 90 meter.

    B's average speed is 90/20 = 4.5 sec...

    So B covered the distance in 22.222 seconds...

    In that time C coverd only (100 -20) 80 meters....

    C's average speed is 80/22.22222 = 3.6

    Distance between A and C at that time A finished the race is ( 100 - (20 x 3.6)) = 28


  5. #5
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    Re: Race

    I have a diff solution to this problem,

    when B finishes C is 20 m behind B. This means C ran 80m when B covers 100m

    When A finishes, B is 10 m behind A. This means B covered 90m when A finished 100m.
    => C covered 80% of 90m when A finished.
    => C ran for 72m.
    => C was 28m behind A when A finished the race.


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