Algebra

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Jan and Carol are competing in the 500m Freestyle swimming competition. In this event, swimmers make 10 laps in a 50 meter pool. Carol finished the race in 2 minutes, 40 seconds and swam 1/4 m per second faster than Jan. What was Jan's time?

  • Algebra -

    Let j be Jan's time.

    Use the formula d = r * t (distance = rate times time).

  • Algebra -

    still lost

  • Algebra -

    Interesting result
    I used to coach swimming and have never heard of a 500 m race.
    There is a 400 m and a 800 m freestyle.
    As of Dec 3/07 the world record in the 400 m men's freestyle was still held by
    Ian Thorpe, AUS in a time of 3:40.08

    So Carol did 500 m in 2:40 !!! WOW

    Be that as it may, ...
    Carol swam 500 m in 160 seconds, so she swam at a rate of 500/160 m/sec or 3.125 m/sec.
    So Jan swam 1/4 or .124 m/sec slower, so she swam at 3 m/sec

    time = dist/rate
    = 500/3 sec
    = 166.667 sec
    = 2 min, 47 sec (2:47)

  • Algebra -

    I understand the 3.125 m/sec, but I am not sure how you got .124 m/sec

  • Algebra -

    My error Terri, 1/4 of course is .25 not .124

    so let's pick it up at..

    So Jan swam 1/4 or ..25 m/sec slower, so she swam at 2.875 m/sec (3.125 -.25)

    time = dist/rate
    = 500/2.875 sec
    = 173.913 sec
    = 2 min, 53.9 sec (2:53.9)

  • Algebra -

    Thanks for your help!

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