SOLUTION: Greg rides his bike 15 miles in the same amount of time glen rides his bike 21 miles. Glen is traveling 12mph faster than Greg. What if gregs speed?

Question 360209: Greg rides his bike 15 miles in the same amount of time glen rides his bike 21 miles. Glen is traveling 12mph faster than Greg. What if gregs speed?
Answer by mananth(16949) (Show Source): You can put this solution on YOUR website!
Greg rides his bike 15 miles in the same amount of time glen rides his bike 21 miles. Glen is traveling 12mph faster than Greg. What if gregs speed?
..
Greg speed be x mph
Glen speed x+12 mph
...
t=d/r
15/x = 21/(x+12)
15(x+12)=21x
15x+180=21x
180=6x
x= 30 mph ------ greg
30+12 = 42 mph ---- glen's speed
..
m.ananth@hotmail.ca

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