Question 522641
since the trains are moving towards each other
add up the speed 125+105=>=230 mph

1mph convert to ft/s

1 mile = 5280 ft
1 hour = 3600 seconds

1*5280/3600 = ft/s
=1.47 ft/s

230 mph = 230*1.47= 337.3ft/s

time = 45 seconds

distance = 337.33*45= 15180 feet

They will be 15,180 feet away.