SOLUTION: please help me solve this:
on a certain trip, edgar drive 231 km in exactly the same time as erwin drive 308 km. If Erwin's rate exceeded that of edgar by 13 kph. Determine the r
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Question 844170: please help me solve this:
on a certain trip, edgar drive 231 km in exactly the same time as erwin drive 308 km. If Erwin's rate exceeded that of edgar by 13 kph. Determine the rate of Erwin
Answer by algebrahouse.com(1659) (Show Source): You can put this solution on YOUR website!
Distance = rate x time
distance
-------- = time
rate
231
--- = Edgar's time
r
308
------ = Erwin's time {Erwin's rate exceeded Edgar's by 13 kph}
r + 13
231/r = 308/(r + 13) {their times were equal}
231r + 3003 = 308r {cross-multiplied in the proportion}
3003 = 77r {subtracted 231r from each side}
r = 39 {divided each side by 77}
r + 13 = 52 {substituted 39, in for r, into r + 13}
Erwin's rate was 52 kph
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