Pls answer What are the values of and ?

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?

What makes a trapezoid an isosceles trapezoid?

What is the absolute value of the complex number -4- 2 v14 3.15 14 18