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January 30, 2015

January 30, 2015

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

- Math -
**Ms. Sue**, Wednesday, June 13, 2012 at 3:06pmLet x = the mph for the first three hours.

540 = 3x + 6(x + 30)

540 = 9x + 180

360 = 9x

40 = x

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