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Homework Help: How do I calculate this?

  1. Sep 16, 2007 #1
    “if a cyclist travels at an average speed of 3m/s-1 and turns home at an average speed of 9m/s than what is the average speed of the whole journey?”

    do I need an equation to work this out?

    And please show how you got your answer.

  2. jcsd
  3. Sep 16, 2007 #2
    Try using the equations:

    [tex]\bar{speed} = \frac{\Delta X}{\Delta t}[/tex]
    [tex]X = V_0{}t + at[/tex]

    Also, try using different values for X.
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