SOLUTION: Richard�s average driving speed is 6 kilometers per hour faster than Thor�s. In the same length of time it takes Richard to drive 640 kilometers, Thor drives only 592 kilometers.

Question 675456: Richard�s average driving speed is 6 kilometers per hour faster than Thor�s. In the same length of time it takes Richard to drive 640 kilometers, Thor drives only
592 kilometers. What is Richard�s average speed?
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
Richard�s average driving speed is 6 kilometers per hour faster than Thor�s. In the same length of time it takes Richard to drive 640 kilometers, Thor drives only
592 kilometers. What is Richard�s average speed?
**
let x=Thor's average driving speed
x+6=Richard's average driving speed
Travel time=distance/speed (same for both)
..
592/x=640/(x+6)
592(x+6)=640x
592x+3552=640x
48x=3552
x=74
x+6=80
Richard's average driving speed=80 km/hr
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