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?
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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