SOLUTION: A car drove from a city A to a city B.The distance between the two cities is 350 km.After 200km, the speed of the car decreased by 20 km/h. The total trip took 5 hours. Find the sp

Question 1107071: A car drove from a city A to a city B.The distance between the two cities is 350 km.After 200km, the speed of the car decreased by 20 km/h. The total trip took 5 hours. Find the speed of the car in the first part of the journey.
Answer by josgarithmetic(39630) (Show Source): You can put this solution on YOUR website!

                    speed      time         distance
part1                r         200/r         200
part2               r-20       150/(r-20)    150
total                          5

Simplify and solve this for r.

or
The 80 km per hour is the one which makes sense.
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