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?
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Greg speed be x mph
Glen  speed x+12 mph
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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
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m.ananth@hotmail.ca