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Math Help - Extended-response question

  1. #1
    Junior Member
    Feb 2009

    Extended-response question

    It costs (12 + 0.008x) dollars per kilometre to operate a truck at x kilometres pet hour. In addition it costs $14.40 per hour to pay the driver.
    What is the total cost per kilometre if the truck is driven at:
    a) 40 km/h?
    b) 64 km/h?

    Any help would be appreciated. Thanks!
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  2. #2
    Super Member
    Mar 2010
    The cost consists of two component - the truck and the driver. The cost for the truck is given as 12 + 0.008x dollars per km. The cost for the driver is $14.40 per hour, and in one hour, the truck goes x kilometres, so the cost is $14.40/x dollars per km.

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