Question

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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Answer 1

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