Inactive Tutor answered 05/01/18
Tutor
New to Wyzant
v = speed of slow boat
v + 12 = speed of fast boat
t = travel time = 2.5
When they meet,
(v + 12)t = 70 - vt
(v + 12)(2.5) = 70 - 2.5v
Now solve for v and finish from here.