Question 62274
Distance = (Rate)(Time) [use the distance formula]
Bob: 600=(r+20)t
Solve for t: 600/(r+20)=t
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Kurt: 450=rt
Solve for t:450/r=t
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Bob's time = Kurt's time

So, 600/(r+20)=450/r[Solve for r]
(600)(r)=(r+20)(450)
600r=450r+9000
600r-450r=9000
150r=9000
r=9000/150
r=60 miles per hour
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Kurt=r=60 miles per hour
Bob: r+20=60+20=80 miles per hour