Homework Help: Algebra

Posted by Leslie on Sunday, October 9, 2011 at 10:06pm.

During a hurricane evacuation from the east coast of Georgia, a family traveled 260 miles west. For part of the trip, they averaged 70 mph, but as the congestion got bad, they had to slow to 20 mph. If the total time of travel was 9 hours, how many miles did they travel at the reduced speed?
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Algebra - tchrwill, Monday, October 10, 2011 at 9:55am
1--70t1 + 20t2 = 260
2--t1 + t2 = 9 or t1 = 9 - t2
3--Substitute (2) into (1) and solve for t2
4--Distance traveled at 20mph = 20t2

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