Tatiana left the coffee shop traveling 8 mph. Then, 3 hours later, Laura left traveling the same direction at 20 mph. How long until Laura catches up with Tatiana?

Answer 1

T distance = 8 t
L distance = 20 (t-3)
so
8 t = 20 t - 60
60 = 12 t
t = 5
t-3 = 2 hours for Laura