Two trains leave the station at the same time, one heading west and the other east. the westbound train travels at 80 miles per hour. the eastbound train travels at 90 miles per hour. how long will it take for the two trains to be 238 miles apart?

1.4 hour, or 1 hr 24 min

Step-by-step explanation:

The trains separate at the rate (80 + 90) mph.

Recall that distance = rate times time, or time = distance / rate.

                                            238 mi

Here, the elapsed time is   = 1.4 hr, or 1 hr 24 min

                                             170 mph

i hope this is what you were looking for.

see attached graph