The bird has flown a total of 60 miles, the trains crash after 1 hour, found by giving each train a position equation: X=X0+vxt, so A=0+30t, B=60-30t, find A=B, 30t=60-30t, t=1hour, then Bird=0+60mph(1hour)= 60 miles.
Thank you for confirming the infinite trips, its been a while since i took...