Question 148931
LET THE TIME OF THE LOCAL TRAIN=50/X
LET THE TIME OF THE EXPRESS=50/2X 
50/X=50/2X+1
50/X-50/2X=+1
(2*50-50)/2X=+1
(100-50)/2X=+1
50/2X=+1
2X=50
X=50/2
X=25 MPH FOR THE LOCAL
25*2=50 MPH FOR THE EXPRESS.
PROOF:
50/25=50/50+1
2=1+1
2=2