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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.

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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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