Homework Help: Math

Posted by Ciara on Wednesday, June 13, 2012 at 2:58pm.

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 - Ms. Sue, Wednesday, June 13, 2012 at 3:06pm
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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