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    LouisR's Avatar
    LouisR Posts: 1, Reputation: 1
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    #1

    Sep 18, 2014, 10:12 PM
    Physics
    You plan a trip on which you want to average a speed of 85k/h. you cover the first half of the distance at an average speed of only 62k/h.
    What must be your average speed in the second half of the trip to meet your goal?

    Answer in units of k/h.

    Looking for the formula to solve this problem. How would it be set up?
    J_9's Avatar
    J_9 Posts: 40,298, Reputation: 5646
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    #2

    Sep 18, 2014, 10:16 PM
    We aren't allowed to do the work for you.

    What do you think the answer is? We can help you if you provide what you think the answer is.
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #3

    Sep 19, 2014, 06:02 AM
    Hint: speed= distance/time, and time = distance/speed. You need an expression for time for each half of the journey, then total distance divided by sum of the two times is the average speed.
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