Find the gcf of each pair of numbers? 40 and 48

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?

The zoo collects $9.60 for every 24 tickets sold. how much will be collected for 400 tickets?

Kira looked through online census information to determine the overage number of people living in the homes in her city what is true about kira's data collection?