Question 186372
rt=d
r(6+2)+(r+15)6=580
r*8+6r+90=580
8r+6r=580-90
14r=490
r=490/14
r=35 mph. is the speed of the slower train.
35+15=50 mph. is the speed of the faster train.
Proof:
35*8+50*6=580
280+300=580
580=580