What is the unit rate for 9 pages in 3 hours? group of answer choices 1 page/3 hours 3 pages/1 hour 6 pages/1 hour 9 pages/3 hours

(40 points) i need some . an answer definition is appreciated as well.

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?

With alll of except for the 2 that i did already