Any multiple of 12 is also a multiple of 4.explain why it’s true?

I'll give brainliest if you answer right : )

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?

Solve this problem! extra ! 3025/5.5 = a/90.75