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'

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'

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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) (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.
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