d -> distance between Alba to BentonGHong14 wrote:
x miles -> covered at 50miles/hr
d-x miles -> covered at 60 miles/hr
Statement 1:
x/50 + (d-x)/60 = 10 ; d = 530
clearly sufficient as, one equation in one variable "x".
Statement 2:
(d-x)/60 - x/50 = 4 --- Insufficient as 2 variables, 1 equation.
So, A
