Whats a math problem. with the equation 5xn=20

me now!

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?

Non-euclidean geometry was discovered when, in seeking cleaner alternatives to the fifth postulate, it was found that the negation could also be true a. true b.false

Which equation represents a direct linear variationa. y=x2b. y=2/5xc. y=1/xd. y=x+3