Martia orders 12yd of material to make banners. if she needs 1 foot of fabric for each banner, how many banners can she make?

You can make 36 banners. there are 3 feet in 1 yard so if you multiply 12 and 3 you get 36

Relationship between distance-velocity-time as following
d = vt

The second train will catch up on the same distance as the first train.
d₁ = d₂

The first train left one hour before the the second train, that means the first time has an hour more in running time.
t₁ = t₂ + 1

Now plug in the numbers
d₁ = d₂
v₁t₁ = v₂t₂
60t₁ = 80t₂
60(t₂ + 1) = 80t₂
60t₂ + 60 = 80t₂
60t₂ - 80t₂ = -60
-20t₂ = -60
t₂ = -60/-20
t₂ = 3
After 3 hours running, the second train will catch up with the first train.

3 hours