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9 January, 06:41

Find the average speed if an object travels 39 m in 7 seconds.

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  1. 9 January, 08:11
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    1hr=60mins

    1min=60seconds

    1hour=60*60=3600seconds

    ratio and proportaion

    distance/time=distance/time

    39/7=x/3600

    times both sides by (7*3600)

    140400=7x

    divide both sides by 7

    20057 and 1/7=x

    answer is 20057 and 1/7 meters per hour

    or

    20.0571428km per hour
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