Question 867898
Train I speed -------------x mph
Train II-------------------(x+15) mph

Moving towards each other
so effective speed = x+x+15 = 2x+15 mph

Distance = 500 miles

Time = 2 hours

d=rt

500 = (2x+15)*2
/2
250=2x+15
-15, -15

235=2x
/2
x=117.5 mph

Train I speed =117.50 mph

Train II speed ------add 15 to train I speed