Respuesta :

n0di0
I think Eva had to drive 300 miles. Here is how I got my answer-

1200 / 3 = 400

400 (eva), 400 (juan), 400 (pam)

x (eva), x+100 (juan) x+200 (pam) 

300 (eva) + 400 (juan) + 500 (pam)

eva = 300