Question 1110289
Let x be the distance they meet from Vancouver
Don travels x km in time t

Brad travels 122-x km in time t

t = d/s

t(don) = x/120

t(brad) = (122-x)/90

t(brad) = t(Don) 

x/120 = (122-x)/90

simplify
x/4 = (122-x)/3

3x= 4(122-x)
3x= 488-4x
7x = 488
x=69.7