Question

Two Cas. A and B starting at the same time, from the same point) are moving
with average speeds of 40 km/h and 50 km/h, respectively, in the same direction.
Find how far will Car B be from Car A after 3 hours.​

Answer 1

Note: I'm a bit confused my the question, I'm answering the question assuming that A travels at 40km per hour. But it doesn't really affect the final anwer though, it'll just affect they work that is shown.

Car A:

3 x 40 = 120

Car B:

30 x 50 = 150

Find the difference in distance.

150-120 = 30

^ then the correct label

= 30 km