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Math Help - Very urgent! Last minute cramming!

  1. #1
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    Very urgent! Last minute cramming!

    Thank you guys so much for all the help you have given me. I do have one more question before the test though (that's in 40min). I don't know how to do this problem.

    A pilot flew a jet from Montreal to Los Angeles, a distance of 2500 mi. On the return trip the average speed was 20% faster than the outbound speed. The round-trip took 9h 10min. What was the speed from Montreal to Los Angeles?

    Just need help understanding the modeling.
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  2. #2
    A riddle wrapped in an enigma
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    Quote Originally Posted by Chinnie15 View Post
    Thank you guys so much for all the help you have given me. I do have one more question before the test though (that's in 40min). I don't know how to do this problem.

    A pilot flew a jet from Montreal to Los Angeles, a distance of 2500 mi. On the return trip the average speed was 20% faster than the outbound speed. The round-trip took 9h 10min. What was the speed from Montreal to Los Angeles?

    Just need help understanding the modeling.
    Probably too late for the test, but....

    d=rt

    t=\frac{d}{r}

    Total time = 9 hrs and 10 minutes = \frac{55}{6} hrs.

    r = rate going

    r + .20r = 1.2r = rate coming back

    distance = 2500 miles at each rate

    Add the two times to equal total time.

    \frac{2500}{r}+\frac{2500}{1.2r}=\frac{55}{6}
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