Question 1092492
r, speed of express train from L.A.


{{{(r+(r-10))(2.5)=470}}}


{{{(2r-10)=470/2.5}}}


{{{2r-10=188}}}

{{{r-5=94}}}

{{{r=99}}}


L.A. Express Train, 99 mph
S.F. Train, 89 mph