Question

Erica drove from Ottawa 80 km/h.Julie left after 1 hr and drove along the same road at 100km/h.How far from ottawa julie overtake.

Answer 1

distance = velocity * time
your looking for when did Erica and Julie drive the same distance so you have to even the time

erica:
d= 80*t
Julie (began after one hour)
d=100*(t-1)

d=d there you go...