Question 116730
DISTANCE=RATE*TIME.
SEEING AS THE DISTANCES ARE THE SAME  WE HAVE THE FOLLOWING EQUATION.
90t=50(t+2.5)
90T=50T+125
90T-50T=125
40T=125
T=125/40
T=3.125 HOURS FOR THE FASTER TRAIN.
PROOF:
90*3.125=50(3.125+2.5)
281.25=50(5.625)
281.25=281.25 THIS IS THE DISTANCE IN KM BETWEEN SMALLVILLE & MEGATOWN.