SOLUTION: On an automobile trip, Laura Iossi maintained a steady rate for the first two hours. Rush-hour traffic slowed her rate by 25 mph for the last part of the trip. The entire trip, a d

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: On an automobile trip, Laura Iossi maintained a steady rate for the first two hours. Rush-hour traffic slowed her rate by 25 mph for the last part of the trip. The entire trip, a d      Log On


   

Question 1002067: On an automobile trip, Laura Iossi maintained a steady rate for the first two hours. Rush-hour traffic slowed her rate by 25 mph for the last part of the trip. The entire trip, a distance of 125 mi, took 2 1/2 hr. What was her rate during the first part of the trip?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
                rate           time         distance
part1            r              2            ( )
part2          r-25            ( )           ( )
totals                        2%261%2F2          125

Fill the empty cells based on sums or RT=D.
                rate           time                 distance
part1            r              2                    (2r)
part2          r-25            2%261%2F2-2=1%2F2           %28r-25%29%281%2F2%29
totals                        2%261%2F2                  125

Use the total distance sum to solve for r.
highlight%282r%2B%28r-25%29%281%2F2%29=125%29