SOLUTION: Richard's average driving speed is 4 miles per hour faster than Kirk's. In the same lenght of time it takes Richard to drive 275 miles, Kirk only drives 255 miles. What is Richard'

Algebra ->  Customizable Word Problem Solvers  -> Mixtures -> SOLUTION: Richard's average driving speed is 4 miles per hour faster than Kirk's. In the same lenght of time it takes Richard to drive 275 miles, Kirk only drives 255 miles. What is Richard'      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 24149: Richard's average driving speed is 4 miles per hour faster than Kirk's. In the same lenght of time it takes Richard to drive 275 miles, Kirk only drives 255 miles. What is Richard's average driving speed?
Answer by Paul(988) About Me  (Show Source):
You can put this solution on YOUR website!
255(x+4)=275x
255x+1020=275x
20x=1020
x=51

51+4=55

Hence, Richard's speed was 55mph and Kirk's speed was 51mph.
Paul.