Answer:
Step-by-step explanation:
So, if we wanna know how many times as long as the race is the river, we just need to use this expression
[tex]River=x(Race)[/tex]
Where [tex]x[/tex] represents the factor that expresses the ratio between both, solving for [tex]x[/tex] we have
[tex]x=\frac{River}{Race}=\frac{310}{42}\approx 7.38[/tex]
Therefore, river's length is 7.38 times the race's length, approximately.