Pls pls help asap pls

What term makes it inconsistent y=2x - 4 ?

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 measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)