Algebra
posted by Leslie on .
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?
Show all work.

170t1 + 20t2 = 260
2t1 + t2 = 9 or t1 = 9  t2
3Substitute (2) into (1) and solve for t2
4Distance traveled at 20mph = 20t2