Train a traveled 173 miles in five hours. for train b, y = 31.35x represents its rate of speed over the same five hours. which train traveled at a faster rate and by what factor? (round to nearest tenth)
a) train b by a factor of 3.2 *my answer
b) train a by a factor of 3.2
c) train b by a factor of 1.1
d) train a by a factor of 1.1 *the correct answer?
can someone explain how d is the correct answer, because i'm really confused : /