Question 962439
D=RT
FIRST TRAIN:
8-3=5 HOURS @X MPH.
SECOND TRAIN:
8-6=2 HOURS @(X+84) MPH.
5X=2(X+84)
5X=2X+168
5X-2X=168
3X=168
X=168/3
X=56 MPH FOR THE FIRST TRAIN.
56+84=140 MPH FOR THE SECOND TRAIN.
PROOF:
5*56=2*140
280=280