Two trains leave the same station at the same time, but are headed in opposite directions. one train travels at 70 mph and the other train travels at 80 mph.

how much times passes until the trains are 600 mi apart?

After 4 hours the trains will be 600 miles part.

Step-by-step explanation:

Two trains leave the same station at the same time, but are headed in opposite directions. One train travels at 70 mph and the other train travels at 80 mph.

Velocity of train 1 = 70 mph

Velocity of train 2 = 80 mph

Since the velocities are in opposite direction

Relative velocity = 70 + 80 = 150 mph

We need to find when the trains will be 600 miles apart.

We have

          Distance = Time x Velocity

          600 = Time x 150

          Time = 4 hours

After 4 hours the trains will be 600 miles part.

the function makes a strait line horizontally with no x intercept but a y intercept at 9.