Answer :
impossible to tell if you dont know their starting position and direction of travel
assuming they start in teh same place and travel in opposite directions
v*t=d -- velocity times time equals distance
55(t) +35(t)=400
solve for t
assuming they start in teh same place and travel in opposite directions
v*t=d -- velocity times time equals distance
55(t) +35(t)=400
solve for t