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.

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> 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.       Log On


   

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) About Me  (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