This is really important please help!

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?

How are sas and sss used to show that two triangles are congruent?

Aline passes through the point (–7, 5) and has a slope of 1/2 which is another point that the line passes through?