Question 35723
Gail's speed is x
Brad's speed is 10+x
Equation:
{{{400/(x)-400/(x+10)=1.5}}}
400[(x+10)-(x)]=1.5[(x)(x+10)]
400(10)=1.5(x^2+10x)
4000=1.5x^2+15x
1.5x^2+15x-4000=0
solve that you get x=46.9
46.9+10=56.9
Hence, Gail's speed was 46.9mph and Brad's speed was 56.9mph.
Paul.