Answer:
in t= 3.77 min they will met each other
Explanation:
If your friend and you start at coordinate x₁ and x₂ respectively, then if your friend is at a distance xF from the bottom
xF= x₁ - v₁*t = 1800 ft - 250 ft/min *t
and you are at a distance xM from the bottom
xM= x₂ + v₂*t = 100 ft + 200 ft/min *t
then both find at xM=xF
x₂ + v₂*t = x₁ - v₁*t
t= (x₁ - x₂)/(v₁+v₂) = (1800 ft - 100 ft)/(250 ft/min+ 200 ft/min ) = 3.77 min
t= 3.77 min
