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    hartlepoolkid Posts: 1, Reputation: 1
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    Dec 3, 2012, 09:13 AM
    How to work out average speed
    A cyclist went 1 km up a hill at 15 km per hour

    Then she went 1 km down the hill at 30 km per hour

    Show that hr average speed for the 2 km was 20 km per hour.

    Has anybody got any idea how to do this?

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