Two trains depart Charlotte at the same time!
One train heads north at 60 mph. The other train heads south at 40 mph. After 4 1/2 hours, how far apart are the trains

The distance between them are increasing with 60+40=100 mph

In an hour distance between them are 100 mph

After 4,5 hours the distance will be 4,5 *100 miles= 450 miles

Step-by-step explanation:

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.

the first option is the answer.