Well,
if d = r + t, then
d = 25 + 120.
So, d = 145 km/hr.
But, if d = r(t), then
d = 25 (120)
and
d = 3000 km/hr
I hope this helps and I'm sorry if I told the wrong answer. The reason why I did multiplication too is because I know as multiplication, but I could b having a brain fart. But go with the first answer.