It took Andre and Lin 1.5 hours for them to meet.
Speed is the ratio of distance travelled to total time taken. Speed is given by:
Speed = distance/time
Let dā represent the distance covered by Andre at time t and dā represent the distance covered by Lin at time t.
Hence:
5 = dā/t
dā = 5t
3 = dā/t
dā = 3t
Andre and Lin are 12 miles apart, hence:
dā + dā = 12
5t + 3t = 12
8t = 12
t = 1.5 hours
It took Andre and Lin 1.5 hours for them to meet.
Find out more on speed at: https://brainly.com/question/3004254
