Tìm x, y, z biết : 1. x/7=7/x 2.x-2/5=3/8

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?

Jimmy can run 3.5 miles in 20 minutes. how far can ne run in one hour and ten minutes?

John has 1/2 pound of oranges to share with julie. if they share the oranges equally, how much will each of them have?