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Math

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Carlo drove for 3 hours in a fog, then increased his speed by 30 miles per hour (mph) and drove 6 more hours. If his total trip was 540 miles, then what was his speed in the fog.

  • Math - ,

    Let x = the mph for the first three hours.

    540 = 3x + 6(x + 30)

    540 = 9x + 180

    360 = 9x

    40 = x

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