vector calculus help

[letsride]

Two boats, A and B, have positions (in km) given by the coordinates (1,3) and (2,7) respectively. Boat A is travelling with the velocity 3i+5j km/h. Boat B sets off to meet boat A at time t=0. Both boats travel at the same speed.

a) when will the boats meet?
b) what is the velocity vector for boat B?

I'm kinda stuck =X

i worked out the position vectors for boat A and boat B, given the velocity is mi+nj  and m^2+n^2 = 34 since they travel at the same speed, and im kinda stuck now...

[supernatural]

Hope this helps

[letsride]

thank you ,
eeeh im so retarded had all the components but didnt think to equate them to one and solve :x